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Comentário sobre 35000 dólares por uma noite literalmente de outro mundo por Inis Elize

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Escuto sobre essa estória de turismo espacial desde os idos de 2009-2011 e até hoje essa baboseira não se concretizou. Se houvesse uma passagem barata para o ''espaço exterior'', algo que custasse menos de 50 mil reais, é claro que eu compraria na hora. Mas isso nunca vai existir porque não existe ''espaço exterior'', apenas aqui dentro. O domo é impenetrável (ninguém sabe de que material ele é feito). Então me desculpem, Virgin Galatic e SpaceX, assim como outras empresas ''espaciais'', são apenas fantoches das agencias espaciais que vão prometer por anos algo que nunca entregarão, sugando bilhões de dólares que jamais serão devolvidos. A Terra Plana não é só sobre a Terra Plana. É sobre, antes de mais nada, um plano maligno que visa esconder de nós o nosso Pai. Um plano que visa nos fazer acreditar que nada faz sentido nem tem propósito. Simplesmente não é possível acreditar em Deus em uma bola giratória que flutua em um universo aleatório. Todo crente do globo é, em essência, um ateu, mesmo que ele afirme o contrário. DEUS TE AMA. A TERRA É PLANA
          

Kein Frühstück, keine E-Mails: Der verrückte Tagesablauf von Elon Musk

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Elon Musk wäre nicht so erfolgreich, wenn er nicht so viel arbeiten würde. Um alle Aufgaben unter einen Hut zu bekommen, verfolgt der 45-jährige Unternehmen einen strengen Tagesplan: 

 

Das könnte euch auch interessieren:

 Elon Musk sagt: Dieses Buch hat mein Leben verändert

 Elon Musk erklärt in nur einem Satz, wie Erfolg funktioniert

 Elon Musk enthüllt, wie viele Stunden er nachts schläft

Elon Musks Tag ist komplett durchgeplant.

Elon Musk gilt als Workaholic, der noch mitten in der Nacht Twitter-Anfragen von Tesla-Kunden beantwortet.

Der 45-Jährige verbringt seine kompletten Arbeitswochen bei seinen beiden Unternehmen Tesla und SpaceX, schlingt sein Mittagessen dabei in fünf Minuten herunter und nimmt keine unangemeldeten Anrufe entgegen, um keine Sekunde seiner Zeit einzubüßen. 

Es ist also nicht verwunderlich, dass sein Alltag vollkommen durchgetaktet ist. 

Basierend auf früheren Interviews, hat der Business Insider einmal aufgeschrieben, wie ein durchschnittlicher Tag für die Silicon-Valley-Berühmtheit aussehen könnte:



Elon Musk beginnt seinen Tag bereits um 7 Uhr. Auf der Online-Plattform „Reddit“ erwähnte er, dass er etwa sechs Stunden in der Nacht schläft.

Quellen: EntrepreneurBusiness Insider 



Musk überspringt das Frühstück normalerweise. Gelegentlich nimmt er sich aber die Zeit, eine Tasse Kaffee und ein Omelette zu sich zu nehmen.

Quelle: Auto Bild



Den Rest der Story gibt es auf Business Insider Deutschland
          

Blue Origin’s expansion plans rush ahead at its Seattle-area HQ — and in Los Angeles

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Blue Origin’s expansion plans rush ahead at its Seattle-area HQ — and in Los AngelesKENT, Wash. — Amazon CEO Jeff Bezos' Blue Origin space venture is rapidly expanding on several fronts, ranging from its headquarters facility south of Seattle to a new beachhead in the Los Angeles area — within the orbit of its main competitor, Elon Musk's SpaceX. Just three and a half years ago, Blue Origin's workforce amounted to 600 employees, and even then, Bezos said his company's 300,000-square-foot office and production facility in Kent was "busting out of the seams." Now the employee count is at around 2,500, heading toward 3,500 in the next year. That's according to a report from… Read More



          

NASA’s in the market for quick taxi rides to and from International Space Station

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NASA’s in the market for quick taxi rides to and from International Space StationNASA already has committed billions of dollars to procuring regularly scheduled rides to and from the International Space Station from commercial space taxi operators — but now it says it's interested in buying short-term trips as well. The proposed arrangement, detailed on Tuesday, is aimed at giving a boost to the commercialization of space operations in low Earth orbit, as well as to NASA's drive to send astronauts to the moon by 2024. It also makes the line dividing government-funded and privately funded space efforts even fuzzier. SpaceX and Boeing are both building spacecraft to serve as taxis to the… Read More



          

类似「星链」的低轨通信卫星网发展前景如何,如何看待互联网公司参与低轨宽带互联网星座建设?

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谢邀@知乎科技

下面我尝试尽量不用任何专业的技术术语,来分析和解释这件事情,让完全不做通信、和卫星行业无关的人也能看懂。

为什么低轨通信卫星最近一段时间成了热点?

最近一段时间,低轨通信卫星星座,或者说低轨卫星互联网这件事由于SpaceX 的星链计划正式推出,成为新的热点。得到平台的邵恒头条都专门做了一期节目,介绍了马斯克计划可能带来的影响。实际上,国内航天界也正在快速跟进,航天国家队早就已经推出了鸿雁、虹云等多个低轨通信卫星计划,国内的商业航天初创企业中,银河航天做的就是低轨通信卫星。

既然这么多人都在做,投资人也不是傻子,肯定是看到了巨大市场,或者说看到了巨大的潜在市场。但其实低轨通信卫星网到底在商业模式上是否能够成立,能不能赚钱,还是一个巨大的未知数。

可是对于华为、腾讯这样的巨型企业,他们最怕的不是竞争,而是失去进入空白地带的机会。因为最大的商业机会一定在空白地带,因为现在还是荒地,所以就蕴含着巨大的可能。如果这个空白地带真的足够大,一旦失去了机会,那就意味着失去未来。

所以SpaceX、Oneweb这几家都在向前跑,就看谁更快,技术更先进,能够率先推出商业化的服务。另一方面,一些大佬也在暗地里保持高度关注,随时准备跳进来,但又担心风险过大,所以目前大多数还保持着一种高度关注的状态。

低轨通信卫星网络的前景如何,这其实是一个最近几年来,从通信设备制造商、通信运营商、卫星制造商反复讨论的话题。结果是什么样的呢?非常的诡异:

大家都觉得这玩意蕴含着巨大机会,有非常大潜在商业市场,但要具体说清楚到底低轨通信卫星给谁服务?有多少用户?如何收费?能不能赚钱?全都说不清楚。

简要解释一下其中的道理。这要从卫星通信的发展说起。

卫星通信以前为啥那么低调?

通信系统是给谁服务的?当然是人,所以任何通信设备、通信系统本质上都是人和人的通信,或者是给人服务的。即便是所谓的IoT,也就是物联网,这些万物为什么要互联?那也是因为物背后是人,是人需要这些万物的数据。

通信行业是一个巨大的商业市场,比互联网市场大多了,规模大概8万亿美元。但这其中的卫星通信市场规模非常小。上个世纪90年代,通信卫星一度非常被看好,因为一个地球静止轨道的通信卫星就几乎可以覆盖三分之一地球面积,所以不需要很多卫星就可以提供覆盖全球的通信服务。而且卫星通信还有一个巨大的好处,就是通信费用与距离几乎无关,想想就在十多年以前,我们打长途电话要比市话贵很多呢,所以当然卫星通信有巨大的潜力。那时候,全世界都非常看好卫星通信,但结果是卫星通信市场没有做大,铱星计划也失败了,因为它太贵,使用太低频,你是能覆盖全球,但我自己一辈子都没多少天离开自己的家,所以这对大部分老百姓是没有意义的。

光纤出现以后,单位信息的传输成本迅速下降,就算加上布设光纤的成本,也比通信卫星划算,容量也更大。可是卫星还可以无线接入啊?这又被移动蜂窝通信技术给干死了,大部分人都聚集住在城市里,只要建设好地面移动通信网络,你就可以高速接入网络,由于用户众多,所以通信价格很低。从2G一直到5G,地面移动通信技术发展太迅速了,华为就是这么发展起来的,由于这是一个巨大的时代趋势,所以只要是上了船的,日子都过的不错。

没上船的,比如卫星通信制造商,其实日子过的都很一般,铱星破产时,你知道它才有多少用户吗?不到一万个,所以也只能卖给美国空军了。再比如海事卫星,技术上很好,但市场并不大,日子也很紧。到2018年,铱星在全球也只有110万用户,全球星只有74万用户,话说中国移动北京市海淀区营业部的用户数都比这个多吧?所以整个卫星通信行业,从制造商到运营上,和地面移动通信行业,那日子真的是“一个天上一个地上”。全世界所用的卫星通信用户加在一起,估计也只有350万个。

为什么大家忽然对低轨通信卫星网络有兴趣了?

那么现在到底发生了什么?为什么大家又忽然认为低轨通信卫星有市场了呢?

这件事从美国开始的,我们还得先看看美国的情况。

整儿卫星通信服务市场,全世界基本都在美国,为什么?因为美国乡下真的用卫星来上网。这和中国有很大的不同。注意在我们中国乡下,也用通信广播卫星看电视,但打电话上网我们都是用地面网络。

这其中有非常深刻的政治经济原因,其中一点是因为美国的土地私有化,所以要铺设长距离光纤,难度就很大。一个农场主不同意,那你这条光纤就铺不过去了,所以用卫星提供基础通信服务就很方便,在成本上就有优势了。在中国不同,我们建设基础设施很快,光纤本身又不贵,所以没这个问题。

这样一来,美国地面移动通信系统的建设就是相对落后的,没那么多基站。那现在都5G了,5G要求的基站更密,美国怎么快速赶上呢?直接在太空中建设基站就是一个选择,所以SpaceX,OneWeb,乃至亚马逊,Google都在琢磨这件事。

另一个原因是技术推动,因为一方面小卫星技术成熟化,卫星制造成本越来越低了。同时,SpaceX搞火箭,猎鹰都能重复使用了,号称能把发射成本降到以前的十分之一。那么,火箭这么便宜了,用来发点什么呢?

把人送上天旅游,这个主意不错,SpaceX已经在做了。

还有呢?当然是继续发卫星啊。但是我们似乎不需要那么多卫星,全世界一年,总的航天发射次数也就那么一百来次,所以SpaceX把火箭做便宜之后,必然遇到一个新问题,这些火箭发点什么上去呢?这真的是一个好问题,我相信硅谷的投资人都在这么问马斯克。

想来想去,只能是通信卫星。因为通信、导航、遥感三个主要卫星类型中,导航卫星数量最少,不用考虑了;遥感卫星,现在还没想清楚怎么给大众使用,商业市场价值其实很小;只有通信,这是一个巨大的市场,之前被光纤、地面手机基站给干趴下了,现在有没有机会?

于是,马斯克就搞了一个几千颗星的星链计划,后来又扩展到一万两千颗,这么多星,那商业火箭的市场自然就有了。要知道人类搞了这么多年航天,一共才发射了了9000来个航天器。

低轨通信卫星网的市场在哪里?

搞产品,做市场,也不能光是忽悠,你总得告诉董事会、投资人,这个低轨通信卫星到底给谁服务,有什么比较优势?为什么大家要用它呢?

这就是比较诡异的地方了,你会觉得太多地方都能用,但仔细分析,又觉得没什么人真的会用。

还是拿马斯克忽悠董事会时,阐述的几个场景来分析一下:

第一个,马斯克说因为光在真空中比在光纤中快三分之一,所以可以服务高频交易。但是这个仔细算一下,就发现太牵强了。低轨卫星网络这么复杂,光传输节约的那点时间,还不够中间几次路由交换浪费的时间长呢。就算这些全都不考虑,那也就是1200公里左右,距离交易市场大于这个距离的用户,使用低轨通信卫星才可能节省时间。


第二个:给飞船上网。这个确实是一个市场,很多人已经在飞机上体验过了,但体验并不好,因为一是网速太慢,二是太贵,几十元一小时呢。如果有了低轨通信网络,那确实可以大大提高用户体验,再加上北极航线,由于赤道上空的地球静止轨道覆盖太差了,所以更适合使用低轨卫星。但是,你知道中国一共多少架飞机吗?大数也就是5000架,不能都在天上飞,同时就算有3500架,每架飞机算3000人,所以这并不是一个太大的市场。


第三个:海上通信。地球三分之二都是大海,可惜的是,海上没人啊,所以不需要通信。只有海岛,船舶需要。所以东南亚地球,一直都是卫星通信的主要市场之一,但是由于海底光缆越来越多,所以卫星的比较优势也越来越小。船员在海上很辛苦,因为海事卫星很贵,所以大家也不可能天天和家里视频通话。这肯定是市场,但其实具体计算一下数字,也不是很大。


说来说去,低轨通信卫星最大市场还应该在地面上。但是在城市,光纤和移动通信基站具有很大的优势。因为无论是什么通信系统,最终目的都是降低单位信息的传输成本,提高传输容量。在城市,人口密集,只要一个基站,就可以给很多人提供宽带服务了,卫星的通信速度慢、延迟长,容易中断,在室内还没法用,几乎没有任何优势。

所以,低轨卫星通信的主要市场,还是在城市之外的偏远地区。可是在偏远地区,人口不仅少,还没钱啊,至少在中国肯定是这样的,他们只是你的潜在用户,实际上大概率是用不起卫星通信的。

按照马斯克最近说法:

「SpaceX未来发射收入峰值,每年可能有30亿美元。而来自宽带互联网的收入,可能接近每年300亿美元。」

他是怎么算的呢?马斯克查了一下数据,全球互联网接入服务总收入高达1万亿美元,他觉得SpaceX能占3%,就是300亿美元。

我真想说,兄弟,不能这么忽悠人吧?这也太简单粗暴了。

美国我不熟悉,用中国来算。

大家知不知道胡焕庸线?

胡焕庸线(Hu Line,或Heihe-Tengchong Line,或Aihui-Tengchong Line),即中国地理学家胡焕庸(1901-1998)在1935年提出的划分我国人口密度的对比线,最初称“瑷珲—腾冲一线”,后因地名变迁,先后改称“爱辉—腾冲一线”、“黑河—腾冲一线”。


中科院国情小组根据2000年资料统计分析,胡焕庸线东南侧以占全国43.18%的国土面积,集聚了全国93.77%的人口和95.70%的GDP,压倒性地显示出高密度的经济、社会功能。


那么,假如在中国,星链的最主要用户市场在胡焕庸线的西边,可是那里只有不到中国7%的人口,GDP只有不到4%,那么你怎么赚到互联网接入总收入的3%呢?

这是一个不可能完成的任务。


技术上低轨通信卫星遭遇的难题

这方面, @甜草莓 等朋友已经回答的很清楚了,我就再说一点。

上万颗星组成的巨大星座,如何运行管理,是人类从来没有遇到过的问题。

你家里有几头牛,你拿跟棍子就可以搞定了,有几十头,你可能需要一匹马,如果你有几万头,怎么办?澳大利亚农场主用直升飞机。



v.qq.com/x/cover/4maws8

低轨通信卫星网的发展前景到底如何?

说了这么多,似乎低轨通信卫星完全没有前途,吴军老师就是这么认为的,他在得到讲5G时,就明确表示不看好星链计划。我把自己的笔记放在下面给大家参考。


但是,虽然有很多技术困难,商业上也不够清晰,目前业内达成的共识还是这件事必须得做,势不可挡。

最简单的理由就是,你要做什么,常常不是你自己决定的,而是你的对手做什么决定的。即便完全从商业上讲,虽然刚才我们分析的那些用户场景,似乎都不是很大,但我们的分析是静态的,不是动态的。

一个新事物出现,会改变很多东西,会催生很多从来没想到的应用。星链的市场不必完全是一个通信市场,这样一来,就突破了刚才的分析。但现在大家确实都看的不够清楚。


如何看待互联网公司参与?

从需求角度,腾讯等互利网公司的最大优势是它在给最广泛的用户提供内容服务,比如微信已经成为基础设施。因此,实际上腾讯是最了解用户的。从这个角度,腾讯具备能力,面向未来,也有战略上的紧迫性要求腾讯必须更加主动的参与低轨星座的研究和建设,这实际上也是Facebook等公司为何对低轨星座非常热心的原因。

顶级企业,实际上面对的最大挑战和最大基于是“空白”,低轨互联网是一个空白地带,是大事,不得不关注和参与。此外,下一代的互联网,下一代的无线通信网络,必须更多的考虑内容,不能再简单把所有信息都看做同等重要。通信网络传输的信息有许多不同维度的划分,从5G时代,就必须考虑内容本身的特点。从这个角度,腾讯就更有优势。设想一下,如果腾讯能够提供一个全球覆盖、永不下线的在线游戏,并能够保证用户体验,那是相当有市场竞争力的。但要做到这一点,技术上有难度,低轨互联网系统在设计时就应该予以考虑,目前做的工作还很少。


以上,请批评指正。



来源:知乎 www.zhihu.com
作者:逝水

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延伸阅读:
互联网/移动互联网公司从租赁第三方数据中心到自建数据中心,一般这个转换点在什么时候?
通信工程 偏互联网方向的到底是做什么的?

          

类似「星链」的低轨通信卫星网发展前景如何,如何看待互联网公司参与低轨宽带互联网星座建设?

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本来,卫星移动通信系统,特别是低轨卫星移动通信系统正按步就班地依照自己的设想(天基互联网接入服务为主要应用模式)向前发展,并试图同地基移动电话系统寻求相遇、融合之道。

忽遇春风,“5G”来了!!

5G的万物互联特性、以及3GPP R17讨论区正在寻求的与卫星通信融合的话题,给当前的低轨卫星移动通信系统(星座)发展提供了“天地一体化网络”的无限想象与可能。天地一体化并非新生事物,“铱星”一代就是人类第一次进行天地一体化的尝试。在摩托罗拉公司如日中天的1998年,推出了雄心勃勃的“铱星”低轨通信卫星星座,由77颗(66+11)低轨通信卫星组网,为用户提供手机式的全球个人移动通信服务。这是一套在技术理念和商业愿景上都非常先进的系统,但当时的现实脚步并未跟上前进灵魂的速度,2000年3月,由于用户收益不足以维持系统运维,“铱星”背负40多亿美元债务正式破产。后来由美军接手,再次复活,目前正在部署的下一代系统(Iridium Next),提供通信、气候变化监视、多光谱对地成像等综合业务。但是“铱星”一代的设想是要彻底取代地面移动通信系统,成为人们移动通信方式的主导,这显然超出了时代的理解和技术基础。

当前,人们越来越深刻地认识到,星地系统由竞争走向合作,卫星系统以提供回程服务、基站拉远等方式成为地面移动通信网络的补充,优势互补,合作共赢,这才是邂逅之道。我国《国家民用空间基础设施 中长期发展规划(2015-2025 年)》中明确提出:“坚持天地一体化发展,空间系统与地面系统同步规划、同步研发、同步建设、同步使用,提升系统整体效能。”

天地一体化网络背景下,用户能够在任意时间、地点透明地享受来自于地面网络/天基网络的融合服务。[融合服务的维度:覆盖融合、业务融合、体制融合、用户融合、芯片融合、终端融合、应用融合]



近几年,低轨互联网卫星移动通信系统突飞猛进,典型的包括O3b、OneWeb(一网)和SpaceX的Starlink星座【知乎号我们的太空:《关于StarLink,我们需要知道的事》],国内的“鸿雁”星座、“虹云”星座,以及中国卫通的“低轨移动宽带互联网卫星星座”。

低轨卫星移动通信系统的共同特征包括:多采用中、低轨道,相比同步轨道卫星可以大幅度降低往返传输时延,使卫星传输的延迟可以与地面光纤相当;采用数量众多的微小卫星组网实现大范围覆盖;通过模块化设计大幅度降低卫星生产周期与成本,从而降低通信资费;多采用Ka/Ku频段,提高系统容量;终端小型化、智能化趋势明显;而且业务类型都聚焦宽带互联网接入服务。这些特征,使得卫星通信系统越来越具备同地面通信系统融合的切入。

ITU针对卫星与地面5G融合的问题,提出了星地5G融合的4种应用场景,包括中继到站、小区回传、动中通及混合多播场景,并提出支持这些场景的关键因素。

3GPP从R14开始着手开展星地融合的研究工作。在TS22.261中,对卫星在5G系统中的角色和优势进行了探讨, TS22.822中,3GPP工作组SA1对与卫星相关的接入网协议及架构进行了评估,并计划进一步开展基于5G的接入研究。在这份报告中,定义了在5G中使用卫星接入的三大类用例,分别是连续服务、泛在服务和扩展服务。并讨论了卫星终端特性的建立、配置与维护,以及在卫星网络与地面网络间的跨协议漫游及通信切换问题。

3GPP在R16中开展名为“面向‘非地面网络’中的5G新空口”研究项目,定义了包括卫星网络在内的非地面网络(NTN:Non-terrestrial networks)的部署场景。按照3GPP的定义,5G网络中的NTN应用场景包括8个增强型移动宽带(eMBB)场景和2个大规模机器类通信(mMTC)场景。借助卫星的广域覆盖能力,可以使运营商在地面网络基础设施不发达地区提供5G商用服务,实现5G业务连续性,尤其是在应急通信、海事通信、航空通信及铁路沿线通信等场景中发挥作用



2017年6月,英国电信、空客防务及航天公司、萨里大学等16家企业与研究机构联合成立了SaT5G(Satellite and Terrestrial Network for 5G)联盟,计划在30个月内完成卫星与5G的无缝集成方案,并进行试用。

作为全球范围内5G技术和商用的第一梯队国家,我国在星地5G融合发展中当然有自己的声音与行动。国家队中国卫通公司基于高通量卫星(中星16)成功完成卫星传输5G数据业务的融合测试(2019年11月),利用高通量卫星的便携站与地面5G网络之间搭建卫星基站回程试验系统,实现了基于星地链路的5G基站与核心网之间信息传输,这是卫星与5G网络互联互通实质性的探索。

就在我们刚刚步入5G元年之际,在学术界和产业界的努力下,低轨卫星移动通信系统与5G已经产生了美丽的邂逅,步入融合。

在这个技术大背景下,还有很多技术挑战等着我们共融、互通的去解决。

互联网公司的所谓介入也好、联合也好、杀入也好,

首先会促使低轨通信卫星网产业化,产业化有什么好处?要解决什么问题?

第一个要解决技术发展问题,即技术创新的问题,促进相关技术问题的解决。

我国的低轨通信宽带卫星网,说到底,有好多事没想明白,是在跟着跑。有时候,我们在激烈的讨论一个问题:我们到底要一个什么样的低轨通信宽带网?为什么我们概念,一起步就面临着理论和技术的束缚与短板?我们的实现途径到底是什么?我们的性能、可靠性是相对先进还是相对落后?我们没有一个传统意义上的研究院或者研究所在牵引着我们了,之前国家层面都是重工程、重单个项目(北斗系列、嫦娥系列开始正在改变),重试验,轻科研、轻理论。我们遇到一些新技术或者新概念的产品时,往往会感到基础理论跟不上,或者说是没有基础理论,课本教科书都是引进的,这样有时候遇到重大难点时,就会发现,哦,这里有个技术瓶颈!产业化,是解决这个问题的很好的办法,大家一起攻关,从这一点,呼唤更多的互联网公司进入这个新兴市场。

第二个是要解决传统体制限制技术创新应用的问题

目前我国的低轨星座宽带卫星网的建设,还是以我国国家队牵头的,国家队六十年来形成了一个非常完整的科研生产体系,这个体系非常好,但是有其固有特点,新技术应用有一点的难度哟。如果能和互联网等公司互相借鉴取长补短,行成产业化将是多么好的局面,例如产品研发定制化向产品市场型谱化的转变,如发射单一化向互通化的转变,如保护性专利向知识产权转化的转变,再例如问责式的管理向解决问题式的管理转化转变,这些都是互联网公司或者商业公司进入以后会带来的积极变化。

第三个,相关地面设备、试验室等资源互通互用的问题

互联网公司的相应自建的基础设施、基站以及国家一些地面站等基础设施,一旦形成产业化,互通互用,一提高使用效率,二、避免重复建设,三、维护有保障。

再者,说说商业的事。(重点)

一、互联网公司的进入目的?既然来必然带来资本的进入,如何融资、使用(或者叫烧钱),再融资,收益?目的结果一定是为了建立商业应用然后建立商业盈利模式!这是核心更是必要!没有盈利一切都是空谈。对于低轨通信宽带卫星的应用,国家队做了很多重要策划,但是更多是概念性的,对toB和toC具体应用、对盈利的商业模式考虑的不多。未来的商业模式不管是什么样的星座,首先要探索如何为企业和大众提供服务,如何形成成熟的商业模式以获得盈利,在此前提之下,我们再考虑需要研制什么样的卫星?需要什么样火箭?需要什么样的发射服务和测控服务。只有通过产业链联动起来,大家联合去设计,才能把这个产业做好。互联网公司的血雨腥风的市场搏杀之后历练出的市场嗅觉以及市场盈利模式的建立,是最值得看中的!

二、互联网公司的开放性,有利于尽快形成有利益保障下的市场化联动!举例,将来火热的产业化行成后,运载资源的有效性联动性如何推动!不能一发火箭只发一个公司的星而自己的运力还保留了30%或者更多?在我国还在高速发展科技强国空间战略的大背景下,每一发运载火箭的资源都是极其宝贵的!星箭合一?星星联合?座座互通?未来的航天,特别是商业航天,必然是全产业的联动,当然包括低轨通信宽带卫星网的产业!只有全产业联动起来,在建设之前,聊一聊?策划一下?以市场为导向,技术上,标准、接口能否统一?有难度哟!

总之,个人观点,说了一些,供知友参考,供互联网公司参考,供国家队参考。从建设低轨通信宽带网的角度,特别希望互联网公司尽快来,更希望每个参与者都开阔心志,即市场化更产业化,即盈利又互通!!!早点建设成,运营好!

在喜马拉雅之巅,在西双版纳丛林,在炎炎大漠深处,在汪洋碧波之间,畅享我国自主的5G+低轨卫星通信的爽通,畅快!!这是普通使用者期盼的哟!



来源:知乎 www.zhihu.com
作者:我们的太空

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互联网/移动互联网公司从租赁第三方数据中心到自建数据中心,一般这个转换点在什么时候?
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当卫星通信遇见5G:技术与趋势

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卫星通信是否与我们个人很遥远?5G的可能应用场景有哪些?卫星通信和5G会怎样相遇?它们的遇见会给我们带来什么?和大家交流一下。

首先第一个方面卫星通信与我们个人距离远吗?提到卫星和卫星通信,我们很自然想到的是什么?我想可能是这几个关键词:高远,专业,昂贵。

“高远”既有物理上、时空上的感受,又有心理上、情感上的陌生;“专业”意味着我们日常工作生活中难有机会触碰那些呆头呆脑的终端与冰冷复杂的信道设备,是“少数人”的专属;“昂贵”的设备与通信成本则进一步加剧了我们的距离感。所以,“看不见、摸不着、很复杂、玩不起”这种直观感性,让我们觉得,日常生活距离卫星和卫星通信是如此遥远。

我们从狭义的通信概念出发,确实如此。但如果从广义的通信概念来说,卫星通信与当前我们每个人的日常息息相关:常见且容易理解的,包括电视广播节目,气象服务,导航定位与位置服务等;不直接见到但是作为背后体系支撑的,包括(1)行业卫星通信银行、证券、期货、石油、水利、电力、煤炭、气象、海关、铁路、交通、航天、民航、新闻、计委、地震局、烟草和卫生等各部门都建有专用通信网),(2)地面公共通信网的远距离干线传输,偏远地区无光缆传输、无基站覆盖情况下的移动通信、家庭宽带服务等。所以,从这个角度看,如果没有卫星通信,或者没有我们独立自主的卫星通信体系,那么难以想象今天我们所见到的这生机勃勃、多姿多彩的世界将会多么黯淡,我们的生活成本将会有多高企,更不用说有任何便利性。

润物细无声。卫星通信现在已经融入了我们的方方面面,只是不同的视角,看到了不同图景。星空近在咫尺,始终如影随形。

第二个方面,5G的可能应用场景有哪些。5G是当下非常火的话题,也是今天我们在此相遇的缘由。但这个话题不是我擅长的领域,也难有结论性、断言性的表述,毕竟预测总有偏差,而现实总会出人意料。

我们不妨再参考设备制造商和移动运营商的视角,共同展望一下5G的可能应用场景。基于ITU对5G三大基础场景的定义【(1) eMBB(Enhance Mobile Broadband),增强型移动宽带。核心:Gbps级的传输速率,满足高清视频、AR/VR等大带宽需求。(2) uRLLC(Ultra Reliable & Low LatencyCommunication),低时延、高可靠通信。核心:1ms的空口间时延,满足车联网、无人驾驶、远程医疗等低时延、高可靠需求。(3) mMTC(Massive Machine Type Communication),海量物联网连接。核心:100万个/平方公里的连接密度,满足物联网、智慧城市等海量接入需求】,华为在《5G时代十大应用场景白皮书》中指出,云VR/AR,车联网、智能制造、智慧能源、无线医疗、无线家庭娱乐、联网无人机、社交网络、个人AI辅助、智慧城市是5G时代的应用场景。

中国移动的“5G+”规划中,特别强调“5G+AICED”,即5G作为基础接入方式,同AI、IoT、云计算、边缘计算和大数据,产生深度融合,进而与社会形态、生态的方方面面进行全方位融合。

所以,总结一下,5G对4G的提升,让无线通信不再局限于手机通讯和网络连接,手机反而成为5G应用场景中很小的一部分。

相信有个断言会成立,那就是:5G作为一种通用目的技术将开启万物互联的物联网时代,通用目的技术最显著的两大特征,就是与其它技术的强烈互补性和应用领域的广泛性,这使得5G会渗透至各个行业,将和大数据、云计算、人工智能等一道迎来信息通讯时代的黄金10年。

第三个方面,卫星通信和5G会怎样相遇。这是我想和大家重点探讨的部分。两者一定会相遇,并且是一场美丽的邂逅。要邂逅,就要有共同的话题、互补的特质。以手机为代表的地面移动通信系统现在已经与我们的生活高度融合,成为呼吸一样自然的东西。但地面移动通信系统的覆盖能力,一直是最痛苦的短板;卫星通信的天然优势却是无视地形地貌与距离的广域覆盖,但终端和资费都很昂贵。如果他们邂逅,取长补短,既能实现全时全域无缝覆盖,又能成为大众化通信手段,那将多么美妙。

事实上,卫星通信和地面移动通信在2G时代,就尝试过邂逅与融合,产生了卫星移动通信系统。1989年,国际海事卫星组织(Inmarsat)决定将业务范围从航海和航空卫星通信扩展到陆地卫星通信,并更名为国际移动卫星组织,1994年完成改制,变革为国际商业公司,成为最早的卫星移动通信系统服务商,大名鼎鼎的“海事卫星电话”就是它的服务产品。该公司目前通过4颗固定轨道卫星向全球提供移动通信服务【其固定轨道卫星分别为I-4 F1(25°E 服务于欧洲和非洲,2005年3月发射)、 I-4 F2(143.5°E服务于亚太地区,2005年11月发射)、 I-4 F3(98°W服务于美洲地区,2008年8月发射)、I-4A(Alphasat,2013年7月发射)】,是目前商业运营最成功的卫星移动通信系统。

1997年成立的舒拉亚(Thuraya)公司,通过3颗同步轨道卫星(2000年、2003年、2008年发射)提供区域性卫星移动通信服务,主要覆盖亚太地区、欧洲、非洲、中东,可为140余国家和地区的40亿以上人口提供话音、传真、短信、低速数据接入等服务。除此之外,还有TerreStar、SkyTerra等类似系统。

我国2016年8月发射的天通一号移动通信卫星,是我国自主设计制造的第一颗同步轨道移动通信卫星。2019年3月由中国电信集团卫通公司提供商用服务,提供我国国土和周边海域的话音、短信、传真、视频回传、数据、定位等卫星移动通信服务。截至目前,商业用户数量已突破3万,还在稳步增长中。

Inmarsat、Thuraya和天通是同步轨道卫星移动通信系统的代表。

低轨卫星移动通信系统方面,“铱星系统(Iridium)”是先行者。在摩托罗拉公司如日中天的1998年,推出了雄心勃勃的“铱星”低轨通信卫星星座,由77颗(66+11)低轨通信卫星组网,为用户提供手机式的全球个人移动通信服务。这是一套在技术理念和商业愿景上都非常先进的系统,但当时的现实脚步并未跟上前进灵魂的速度,2000年3月,由于用户收益不足以维持系统运维,“铱星”背负40多亿美元债务正式破产。后来由美军接手,再次复活,目前正在部署的下一代系统(IridiumNext),提供通信、气候变化监视、多光谱对地成像等综合业务。

近几年,低轨互联网卫星移动通信系统突飞猛进,典型的包括O3b、OneWeb(一网)和SpaceX的Starlink星座【知乎号我们的太空:《关于StarLink,我们需要知道的事》],国内的“鸿雁”星座、“虹云”星座,以及中国卫通的“低轨移动宽带互联网卫星星座”。

低轨卫星移动通信系统的共同特征包括:多采用中、低轨道,相比同步轨道卫星可以大幅度降低往返传输时延,使卫星传输的延迟可以与地面光纤相当;采用数量众多的微小卫星组网实现大范围覆盖;通过模块化设计大幅度降低卫星生产周期与成本,从而降低通信资费;多采用Ka/Ku频段,提高系统容量;【O3b的单波束可以提供1.6Gbps的传输速率,每颗星70个波束;OneWeb单星容量5-8Gbps,系统总容量超过7Tbps,可为0.36米口径天线的终端提供50Mbit/s的互联网接入服务,为传统互联网架设成本过于昂贵的地区提供高速宽带互联网接入服务】终端小型化、智能化趋势明显;而且业务类型都聚焦宽带互联网接入服务。这些特征,使得卫星通信系统越来越具备同地面通信系统融合的切入。

5G的万物互联愿景,将为卫星通信和地面移动通信融合提供切入。包括ITU、3GPP在内的标准化组织成立了专门工作组着手研究星地融合的标准化问题。

ITU针对卫星与地面5G融合的问题,提出了星地5G融合的4种应用场景,包括中继到站、小区回传、动中通及混合多播场景,并提出支持这些场景的关键因素,包括多播、智能路由、动态缓存管理及自适应流、延时、一致的服务质量、NFV(NetworkFunction Virtualization,网络功能虚拟化)/SDN(SoftwareDefined Network,软件定义网络)兼容、商业模式的灵活性等。

3GPP从R14开始着手开展星地融合的研究工作。在TS22.261中,对卫星在5G系统中的角色和优势进行了探讨,认为,作为5G多种接入技术之一,卫星在一些要求广域覆盖的工业应用场景中具有显著优势。卫星网络可以在地面5G覆盖的薄弱地区提供低成本的覆盖方案,对于5G网络中的M2M/IoT,以及为高速移动载体上的乘客提供网络服务,借助卫星优越的广播/多播能力,可以为网络边缘网元及用户终端提供广播/多播信息服务。

在2017年底发布的技术报告TS22.822中,3GPP工作组SA1对与卫星相关的接入网协议及架构进行了评估,并计划进一步开展基于5G的接入研究。在这份报告中,定义了在5G中使用卫星接入的三大类用例,分别是连续服务泛在服务扩展服务。并讨论了卫星终端特性的建立、配置与维护,以及在卫星网络与地面网络间的跨协议漫游及通信切换问题。

3GPP在R16中开展名为“面向‘非地面网络’中的5G新空口”研究项目,定义了包括卫星网络在内的非地面网络(NTN:Non-terrestrialnetworks)的部署场景。按照3GPP的定义,5G网络中的NTN应用场景包括8个增强型移动宽带(eMBB)场景和2个大规模机器类通信(mMTC)场景。借助卫星的广域覆盖能力,可以使运营商在地面网络基础设施不发达地区提供5G商用服务,实现5G业务连续性,尤其是在应急通信、海事通信、航空通信及铁路沿线通信等场景中发挥作用。

SaT5G联盟:2017年6月,英国电信、空客防务及航天公司、萨里大学等16家企业与研究机构联合成立了SaT5G(Satelliteand Terrestrial Network for 5G)联盟,计划在30个月内完成卫星与5G的无缝集成方案,并进行试用。整个项目将完成以下5个方面的工作:1)定义和评估将星地5G融合的网络体系结构解决方案;2)研究星地5G融合的商业价值主张;3)定义和开发星地5G融合的相关关键技术;4)对星地5G融合的特性和用例进行演示;5)推进星地5G融合在3GPP和ETSI中的标准化工作。

作为全球范围内5G技术和商用的第一梯队国家,我国在星地5G融合发展中当然有自己的声音与行动。国家队中国卫通公司基于高通量卫星(中星16)成功完成卫星传输5G数据业务的融合测试(2019年11月),利用高通量卫星的便携站与地面5G网络之间搭建卫星基站回程试验系统,实现了基于星地链路的5G基站与核心网之间信息传输,这是卫星与5G网络互联互通实质性的探索。民营企业(世域天基通信等)成立的Sat5G-CHINA标准推动工作组,在中国通信标准化协会和航天标准化协会的联合指导下,结合国际力量(比如欧洲委员会旗下的HORIZON2020计划)积极向ITU/IMT组织协调空间频率共享共同,并创造性提出“共享MEO”的5G低轨卫星星座设计理念,也初步实现了5G毫米波通信试验卫星平台。

就在我们刚刚步入5G元年之际,在学术界和产业界的努力下,卫星通信与5G已经产生了美丽的邂逅,步入融合。

第四个方面,卫星通信和5G的相遇会给我们带来什么。综合各方信息,卫星通信和地面5G移动通信的相遇,一定会给我们带来深度融合的“天地一体化网络”。天地一体化并非新生事物,“铱星”一代就是人类第一次进行天地一体化的尝试。但是“铱星”一代的设想是要彻底取代地面移动通信系统,成为人们移动通信方式的主导,这显然超出了时代的理解和技术基础。当前,人们越来越深刻地认识到,星地系统由竞争走向合作,卫星系统以提供回程服务、基站拉远等方式成为地面移动通信网络的补充,优势互补,合作共赢,这才是邂逅之道。

我国《国家民用空间基础设施 中长期发展规划(2015-2025年)》中明确提出:“坚持天地一体化发展,空间系统与地面系统同步规划、同步研发、同步建设、同步使用,提升系统整体效能。”天地一体化网络背景下,用户能够在任意时间、地点透明地享受来自于地面网络/天基网络的融合服务。[融合服务的维度:覆盖融合、业务融合、体制融合、用户融合、芯片融合、终端融合、应用融合]

卫星通信和地面5G移动通信的相遇,是不是会把我们带入6G时代?虽然5G还未全面铺开,但6G已处于研究启动阶段。即使未来的需求及技术方向仍不明朗,但并不影响各方提前布局。

国内外围绕着6G技术及标准的主导权的争夺已经正式开始。关于6G研究的焦点,有两个观点是各方比较一致的,那就是通信维度的陆海空天全覆盖更大传输带宽所需的更高频段

北京邮电大学吕廷杰教授在《5G与产业互联网》的主题演讲中提出了这样的观点:“移动通信的一代、三代、五代通常都是颠覆性技术的诞生,偶数代通常是对奇数代的优化和完善,并发展出创新业务,是可以改写游戏规则的技术” 。

移动通讯技术到目前为止经历了5代,无一例外都是如此。按照这个观点,6G将会是5G的补充和延伸。补充什么,往哪里去延伸?5G的主要标准阶段,是R15和R16。这之后的R17,事实上就是5G的升级目标了。根据3GPP最新的消息,R17讨论区收集到的议题如下:

NR Light:针对中档NR(新空口)设备(例如可穿戴设备)运作进行优化设计;小数据传输优化;Sidelink增强:sidelink是D2D直联通信采用的技术;52.6GHz以上频率:R15中定义的FR2毫米波频段上限为52.6GHz,R17中将对52.6GHz以上频段的波形进行研究。多SIM卡操作;NR多播/广播;覆盖增强;非陆地网络NR:NR支持卫星通信相关标准化;定位增强;RAN数据收集增强;NB-IoT和eMTC增强;IoT和URLLC增强;MIMO增强;综合接入与回传增强;非授权频谱;NR增强;节能增强。

我们可以看到,大量的“增强”字样,说明是在现有技术上的进一步升级再升级。除了“增强”之外,有2个关键的词汇:非陆地网络NR、52.6GHz以上频率。这与“低轨通信卫星”和“太赫兹频段”有紧密关系。因此我们是否可以断言,卫星通信与5G的相遇,会把我们带入6G时代。

卫星通信与5G的相遇和融合会给我们带来很多机会,也一定伴生诸多挑战。

面对机遇和挑战,作为通信人的我们,应该感到很幸运,我们生在这样一个信息技术突飞猛进的时代,能够参与其中,感受巨变;也一定会有强烈的紧迫感,使命感和危机感,我们能为这个时代贡献什么,贡献多少。还好我们都还年轻,我们大有可为!



作者 | 郭浩然 博士

编辑 | 游宗泽



来源:知乎 www.zhihu.com
作者:我们的太空

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如何评价特斯拉于2019年11月21日发布的电动皮卡车Cybertruck?

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时隔两年,又去了加州参加特斯拉发布会,有好多想分享的细节~

上次是重卡,这次是皮卡。

两次都站在发布会第一排C位,把车看了个仔细。

  • 关于设计

这次Cybertruck的造型,比特斯拉的重卡还要科幻。

喷漆透着工业风, 整块的不锈钢板面和车身轮廓,都给人很硬朗的感觉。

会场上,特斯拉还展出了皮卡的设计灵感来源:

比如这辆Elon Musk私藏的路特斯Esprit(曾在1977年的邦德电影中出现过)

还有其他一些启发cybertruck设计的凹造型车:

其实,Cybertruck这个名字,来自电影“银翼杀手”(Blade Runner)。

马总说,他想造一辆像电影里那样的真正有未来感辨识度的皮卡。因为100年来,每一款皮卡都长得太雷同了。

所以昨晚,他推出了一辆让所有人都能记住、能认得的皮卡。

但其实这皮卡的造型,是相当有争议的。

客气点的网友,说它长得像劳拉的胸~

狠一点的,直接说特斯拉的设计师怕是集体罢工了,皮卡设计得就像个大版的门吸或者纸盒,毫无技术含量。。。


与这个cybertruck一样有记忆点的,还有这个发布会的地点:

1 Rocket Road (火箭路1号)

这辆皮卡,就是在SpaceX旁边的特斯拉设计总部诞生&发布的。

马斯克说:电动皮卡的增压版本,将会成为火星的官方用车。

cybertruck从名字到造型,再到发布地点和最终目的地,都是科幻特质、网红基因。


  • 硬核数据

@张抗抗 博士所言:电动汽车的缺点是续航,优点是动力性。优缺点都相当明显,所以技术参数成了衡量一辆电动车的关键。

顶配版的Cybertruck, 百公里加速2.9秒(比911都快),最高时速达到209公里/小时,续航超过800公里。

各项参数都很强, 那定价呢?

基准版3.99万美金(约28万人民币)

双电机板4.9万美金(约35万人民币)

三电机版6.99万美金(约50万人民币)

价格一出,全场观众掌声雷鸣。

在美国,一辆皮卡的平均交易价格,是4.5万美金左右。

所以Cybertruck这个造型,配这个定价,确实是全场的最大亮点。

买一辆Model 3的钱,就能种草一辆Cybertruck,简直了。。。


至于量产时间,马老板在会上没细说,但特斯拉员工表示:

最早也要2021年底才可能量产。而且不会在中国造,但会在中国卖。

我的一位上海朋友,马上预订了一辆,订金1000人民币。

这已经是他的第三辆特斯拉了.....


  • 暴力翻车

姜文和昆汀都说过:最吸引观众眼球的,是性与暴力

特斯拉这次,选择了暴力。

为了展示这款皮卡的强硬坚挺,马斯克让他的员工各种“砸场”。

先拿大锤砸,再拿子弹击 ,表现都很好。

最后没想到,皮卡竟在一个小铁球上,翻车了。

当特斯拉设计总监用一个铁球扔皮卡时,车窗秒碎。

在后座窗再试一次,同样秒碎。

这个bug, 让马斯克脸酸,也成了全场气氛的转折点。

我当时站在离马斯克不到半米的地方,能完全感觉到他的energy一下就掉了一半。

虽然他强装镇定,但现场所有人都感受到他的尴尬和难堪

不止是Musk, 观众的情绪也变了。

昨晚到场的,都是特斯拉的铁杆拥趸。

大家都知道,特斯拉是一个充满争议的公司,它不能犯大错,犯了错就要上头条被各种口水。

所以站在我附近的人,都同时进入了操心模式:

“哎呀,明天又要被媒体集体笑话了”

“cybertruck近乎完美,但却有这个小bug,我觉得这个发布会太亏了”

“今晚肯定有员工,要被马斯克开了”

“特斯拉股票,可能又要因此跌一下,哎!”

我从来没见过另一个品牌的粉丝,像“特粉”那样操碎了心.....


  • 场外亮点

特斯拉发布会,除了产品,还有别的有看头的东西。

比如观众。

很多人完全不像在参加汽车发布会,倒更像是来Party的。

穿得那真叫拼!

另外,这次特斯拉发布会场的吧台,也是一大亮点。

吧台居然闪着龙、写着中文,各种中国元素,提供的食物也是中式汤面。


在会场,我还面基了最喜欢的科技博主MKBHD。

看他采访比尔盖茨、Elon Musk时,这么自带swag;没想到他真人竟然低调可爱,憨诚中还有几分羞涩....

而且他真是好高啊。我这么高的个儿,跟他站一块儿还能矮半头。

最后,说说美国人对这款Cybertruck的看法。

发布会后,与现场的美国人聊了下,发现这车争议很大。

有铁粉认为,这将是他们会买的第一辆皮卡。

但也有些观众,完全不接受这么激进的设计,不喜欢这皮卡起棱起角的。

其中一个更说,刚开始cybertruck开进场时,他以为是个joke, 以为真正的那辆皮卡等下才会入场.....

一位在特斯拉工作的朋友告诉我:他们早就预计到,cybertruck会争议巨大。

如果大众一时难以接受它的激进外观,特斯拉可能会先把皮卡卖给一些重要的网红、rappers以及KOL, 让他们去影响审美。


发布会后,马斯克发推说:Cybertruck之后,暂时不会再推出新产品了。

也就是说,特斯拉整个产品线已搭建完成:包括家用车Model S 3 X Y, 赛博皮卡Cybertruck, 和皮卡搭配的ATV, 超跑Roadster, 还有商用货车Semi。

整个产品线的字母串起来,居然还有内涵:

皮卡发布才两天,在全球的预订量,已经破 20 万辆了。当然,喷它造型的人也不少。

我一直认为,特斯拉是个神奇的存在。

它从来都造不出让90%的人,都爱它7、8分的产品。

却特别擅长打造让10%的人,爱它10分的东西。

站在这款cybertruck面前, 我觉得它真是太 "特斯拉”了!



关于这个发布会,还有个我的“乡下妹子进城”短视频,也许能让大家看到文字外的一些现场气氛~

站在第一排C位看特斯拉Cybertruck发布,是种什么样的体验?_哔哩哔哩 (゜-゜)つロ 干杯~-bilibili

其他相关回答:

如何评价特斯拉(Tesla Motors)电动卡车 Semi?将有何突破?Emma:是什么,让特斯拉登上Pornhub热搜第一名?身为特斯拉车主是怎样的体验?



来源:知乎 www.zhihu.com
作者:Emma

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飞机WiFi遭遇卫星波段的两难选择WiF

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飞机WiFi遭遇卫星波段的两难选择 - WiFi,飞机

谁在中国“首家”提供机上WiFi服务,航空公司各据一词。5月29日,东方航空率先向外界公布消息称,已获得工业和信息化部的批复:在21架飞机上向乘客提供“空中上”服务;同时表示,东航成为全国首家也是全国最大的能够同时向国内、国际航班旅客提供“空中上”服务的航空公司。据媒体获得的一份资料显示,工信部批复提供“空中上”服务的是中国电信集团,可在与其有合作关系的航空公司飞机上进行试验。除了东方航空的21架飞机外,南方航空的10架飞机、厦门航空的6架飞机、中国国航的6架飞机、深圳航空的1架飞机以及海南航空的2架飞机都获得了试验资格。国外航企也获批提供“空中上”服务“在东方航空21架飞机上向乘客提供‘空中上’服务”背后所包含的信息远不止于此。东航最初的一份通稿明确表示,工信部批复同意的是“利用亚太6号卫星通信系统,在中国东方航空股份公司的21架飞机上,按照申请的国内航线和国际特定航线,开展Ku波段航空机载通信业务试验。试验期间,东航可向客舱用户提供互联接入服务。”其中两点值得注意:一是本次工信部批复的是业务测试许可,其部分意义在于为未来相关技术和管理标准提供数据支持;二是测试期间可向乘客提供上服务,即明确了这次测试具有商业属性(商业性测试)。这两点内容也得到了东航转型办主任张弛的确认。针对外航开展“空中上”服务,工信部的意见也非常明确,同样是“国内特定航线”,但清楚地指出,提供的是Ku波段航空机载通信业务“落地试验”。涉及的外航名单包括:美联航、美国航空、达美航空、土耳其航空、阿联酋航空、阿提哈德航空、法航、中华航空、新航等等。这就意味着以往乘坐外航班机,必须飞出中国领空才能开放WiFi服务的局面或将彻底改变,外航飞机的国内飞行段,乘客也可享受“空中上”。而外航投入中国市场运营装备卫星WiFi的飞机数量,现阶段远远多于中国本土航空公司。以达美一家为例,改装过的飞机多达119架,超过中国本土所有可提供“空中上”飞机总和。东航获批飞机数量最多中国本土航空公司中,东航此次获批飞机数量最多,其原因在于东航有能力提供空中上服务、已经装有卫星WiFi设备的飞机数最多。张弛表示,目前东航已经签署了70架飞机的改装合同。其中,获批测试的21架飞机最迟将在个月内全部改装完毕。这21架飞机中包括9架ER(2014年底已接受第4架,2015年计划再引进5架)、6架空客A330、6架波音767。所有ER与三架A330将执飞北美、欧洲等国际远程航线;其余的飞机负责京沪、沪广等国内干线。东航预计,2016年年底完成合同内50架飞机的改装,2017年70架飞机将全部改装完毕。张弛表示,这70架飞机改装合同相当于覆盖整个东航宽体机机队。资料显示,截止2015年3月,东航的机队规模在380架左右。Ka还是Ku:机上WIFI技术两难选择据了解,目前航空公司机上WiFi技术分为基于卫星方式的地空通讯和基于地面基站方式的地空通讯两种。由于后者需要在飞行航路中架设地面基站,因此受地形与天气的限制较多,且无法实现越洋飞行。基于卫星的通信系统是通过卫星及地面主站与各个远端站传送信息实现通信,不同卫星提供的波段信号不同,决定上速度也不尽相同。目前,卫星通信的频率划分主要有L,S,C,Ku和Ka频段。对于航空机载卫星通讯系统来说,Ku波段卫星当前使用较为普遍,Ka波段卫星通信将代表未来发展方向。此前有航空公司表示,鉴于Ku波段卫星方式相对更为成熟,会优先考虑选择。据中国民航局制定的《航空公司运行控制卫星通信实施方案》,目前全球已有上百颗基于Ku波段的卫星为世界各地的用户服务。覆盖中国及其周边地区的Ku频段卫星资源也非常丰富,包括亚洲卫星公司的亚洲4号和亚洲5号,亚太卫星公司的亚太5号和亚太7号,以及中国卫通的中星6A和中星10号等。理论上,Ku波段卫星数据通信能够提供50M带宽,但考虑到在实际服务中所产生的损耗,其所提供的最大带宽为32M。这个速度允许机上人同时上浏览页、微博互动;个人同时观看络视频。有分析人士指出,Ku波段卫星提供数据支持的持续性有待提高,在跨洋远程航班上存在盲区;同时其速度仍稍显缓慢。因此,有航空公司将目光投向Ka波段卫星通信技术,即国际海事卫星组织Inmarsat Global Xpress最新一代卫星通信技术。作为全球首个提供Ka波段卫星通信服务的公司,国际海事卫星组织GX服务计划由三颗卫星实现全球覆盖,目前已有两颗卫星发射升空:第一颗卫星(I-5 F1)于2013年12月发射,2014年7月投入商业服务,目前覆盖欧洲、中东、非洲、亚洲部分地区;第二颗卫星(I-5 F2)于今年2月发射,计划覆盖美国与大西洋地区。据国际海事卫星组织Inmarsat站,其第四颗GX卫星(I-5 F4)正由波音公司制造中,预计2016年中旬完成后将搭载SpaceX发射升空。据悉,每颗卫星的使用寿命大约在15年左右。据民航局提供的资料显示,Ka宽带卫星比传统的Ku卫星带宽容量大十倍,单位成本大大降低,已和地面光纤具有了可比性。虽然Ka波段卫星具备频带宽、上速度快、设备尺寸小等优势;但其目前仍处探索阶段,国内暂时没有络运营商使用,且外界对其用于公共通讯的能力尚未可知。这使得航空公司在技术的选择上产生不小“纠结”。在易航空与各航空公司的接触中发现,各航空公司在采用Ku波段亦或Ka波段之间举棋不定,某资深人士评论:“Ka波段技术较新但卫星较少。Ku波段技术较为成熟。目前的时间点较为尴尬,贸然铺开面临双重风险,Ku可能迅速过时,Ka发展速度存疑。这是导致各航空公司飞机改装进度迟缓的重要原因。”尽管美国卫讯公司开发了一种混合组件,令飞机在飞行中可切换Ka和Ku波段信号,但该方案并非市场主流,混合架构向来不被业界看好,也必然带来成本增加,系统复杂等一系列问题。东航倾向于Ku东航似乎更加倾向于Ku波段卫星通信技术。张弛表示,在综合分析两者的可行性与合理性之后,东航改装合同内的70架飞机将被全部投入到Ku波段的测试中。东航首次使用Ku波段通讯技术的测试是在去年7月。测试载体是一架经过改装的空客A330宽体客机。测试中,中国电信是络运营商,而飞机所接入的设备则由美国松下航空电子公司供应,所使用系统为eXConnect。易航空了解到,松下公司所供应的eXConnect系统是东航的“标配”。无论是原厂打包自带设备的ER,还是需要后期改装的飞机,接入的都是eXConnect系统。据介绍,eXConnect系统可为乘客和机组人员提供广泛的双向宽带连接,包括互联接入、语音、数据以及飞行实时监控和以50Mbps的高速传输航空公司营运数据等功能。但有分析人士称,该系统相对封闭,只能接入Ku波段卫星。这意味着,已装备eXConnect系统的飞机若想使用其他频段,需在接入设备上进行较大改动,从经济性的角度考虑并不划算。“东航未来将对高功率版Ku进行测试,高功率版Ku理论上可达到与Ka相似的速度。而且在飞机设备升级改装上更加容易”。张弛表示。由于机型不同,每架飞机最初的改装费用也有所不同,大约平均每架在数十万美元左右,他补充道。国航Ka与Ku同时进行测试评估国航相关人士向易航空透露,在本次6架飞机进行Ku波段航空机载通信试验后,接下来还要实施Ka波段卫星的测试。根据此前报道,2014年国航与Honeywell公司签署谅解备忘录。根据协议,国航将与Honeywell及国际海事卫星组织合作,于2015年2季度在国航空客A330上安装测试Ka波段卫星通信技术。商业模式未定东航明确表示,在试验期间,空中上服务将完全免费。手法“简单粗暴”,乘客亦可从中获益。但长远看来,乘客方面会有免费蛋糕究竟能吃多久的担心;航空公司也需要探索出可行的商业模式。国航与东航方面此前曾表示,会考虑前向收费(向旅客)与后向收费(向合作方)并行的方式,在与广告商合作的同时,让机上络的受益人按一定比例支付相关流量费用。张弛向易航空透露,未来东航将更多倾向于后向收费,其与部分电商的合作已经在洽谈过程中,但具体名单与合作形式不方便透露。框架虽已成型,但目前中国各大航机上WiFi具体商业模式架构仍处在探索之中。从投入建设、到市场运营、再到未来的收益分享模式,皆未成型。在前向收费中,航空公司需要进行市场培育,摸清旅客付费意向(是否愿意付钱,能够支付多少费用),同时逐步培养乘客机上消费的习惯。而在航空公司考虑更多的后向收费中,需要联络不同类别的企业,以提供多样的服务,并考虑如何进行利益分成。“空中上”虽架构不明,赢利无期,但各方对蛋糕虎视眈眈,对乘客而言,服务虽是航空公司提供,但收费的很有可能不止是航空公司。有消息称,中国相关行政主管单位有意分一杯羹。东航:商业运营近在咫尺根据工信部的批复,本次试验为期一年,至明年5月31日终止。由于目前国内对空中上还没有明确的技术与管理标准,因此在试验期间所提供的数据将辅助相关部门论证这项业务的安全性、稳定性与可控性。关于测试结束后,空中上服务是否会直接投入商业运营的疑惑,张弛给出了明确的答复,测试与运营之间是直接衔接的,而且“很可能不用等到明年5月测试结束,空中上服务就有可能直接投入商业运营。”

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SpaceX Falcon 9 launch: How to watch CRS-19 mission to the space station - CNET

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You don't want to miss this.
          

SpaceX Falcon 9 launch: How to watch CRS-19 mission to the space station - CNET

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SpaceX Falcon 9 launch: How to watch CRS-19 mission to the space station  CNET
          

SpaceX i cztery nowe firmy dołączają do księżycowego programu NASA

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Grono firm mogących konkurować o kontrakty NASA na dostawy ładunków na powierzchnię Księżyca poszerzyło się o pięć nowych przedsiębiorstw. Jednym z nich jest SpaceX, który chce wykorzystać do tego zadania budowany przez siebie statek Starship. Sfinansowane przez agencję wyprawy dostarczą na Księżyc potrzebny sprzęt i przetrą drogę przed astronautami biorącymi udział w misjach Artemis.  Wybrane […]
          

Blue Origin’s expansion plans rush ahead at its Seattle-area HQ — and in Los Angeles

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KENT, Wash. — Amazon CEO Jeff Bezos’ Blue Origin space venture is rapidly expanding on several fronts, ranging from its headquarters facility south of Seattle to a new beachhead in the Los Angeles area — within the orbit of its main competitor, Elon Musk’s SpaceX. Just three and a half years ago, Blue Origin’s workforce amounted to 600 employees, and even then, Bezos said his company’s 300,000-square-foot office and production facility in Kent was “busting out of the seams.” Now the employee count is at around 2,500, heading toward 3,500 in the next year. That’s according to a report from… Read More
          

NASA’s in the market for quick taxi rides to and from International Space Station

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Starliner and space station
NASA already has committed billions of dollars to procuring regularly scheduled rides to and from the International Space Station from commercial space taxi operators — but now it says it’s interested in buying short-term trips as well. The proposed arrangement, detailed on Tuesday, is aimed at giving a boost to the commercialization of space operations in low Earth orbit, as well as to NASA’s drive to send astronauts to the moon by 2024. It also makes the line dividing government-funded and privately funded space efforts even fuzzier. SpaceX and Boeing are both building spacecraft to serve as taxis to the… Read More
          

How to forget a Wi-Fi network on your Windows 10 device

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windows 10 computers

  • You might want to forget a network on Windows 10 if you've moved recently, travel often, or recently changed your Wi-Fi network. 
  • Windows 10 devices can create profiles of Wi-Fi networks you connect to and use them to reconnect to a Wi-Fi network easily, but you can forget a network easily as well. 
  • Visit Business Insider's homepage for more stories.

Whenever your Windows 10 device connects to a wireless network, the operating system will forge a profile of sorts, storing valuable information, such as your password. 

Storing Wi-Fi network passwords will make it easier for you to reconnect to a network the next you're looking to use it. However, if a wireless network updates their privacy settings, you will be unable to connect to the network using your previously-stored information.

Additionally, if a Wi-Fi network is renamed, or you move into a new area that comes with a new Wi-Fi network, you can disconnect your Windows 10 device from any older network you are no longer using. Here is how you can forget a network on Windows 10

Check out the products mentioned in this article:

Windows 10 (From $139.99 at Best Buy)

How to forget a network on Windows 10

1. Turn on your Windows 10 device.

2. On the right-hand corner of your screen click the "Network" icon. 

How to forget a network on Windows 10

3. Click "Network & Internet Settings." This will open a new page on your computer. 

4. Alternatively, you can also access this page by searching for "Network & Internet Settings" in the search bar on the lower left-hand corner of your screen, or by clicking on the "Windows" button, clicking "Settings," and then clicking "Network & Internet Settings." 

5. Click "Wi-Fi" on the left-hand side of the new page. 

How to forget a network on Windows 10

6. Once you're there, click on "Manage known networks," and then click on which network you want to remove from your Windows 10 device.

How to forget a network on Windows 10

7. Click "Forget" to remove the stored network.  

Related coverage from How To Do Everything: Tech:

SEE ALSO: The best all-in-one PCs you can buy

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NOW WATCH: Watch Elon Musk unveil his latest plan for conquering Mars


          

Musk dice: “One More Thing” durante el evento de Cybertruck

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Fanny Nathaniella

Como parte de la presentación oficial del nuevo Cybertruck, Elon Musk, el reconocido CEO de Tesla Motors, SpaceX, SolarCity, The Boring Company, Neuralink, entre otras compañías, ha hecho uso de la emblemática frase del fundador de Apple Steve Jobs “One more thing“. Tal y como lo conocemos, Musk es uno de los personajes que mayores tabloides […]

Esta entrada Musk dice: “One More Thing” durante el evento de Cybertruck es contenido del blog  iOSMac


          

Mulsanne 11 points submitted 1 day agoIt not, really

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There isn't any such substance that can "clean" sperm out of the vagina after the fact. If you're asking about douching, not only is that not such a great thing for vaginal health, it doesn't have the capacity to act as birth control after the fact. As a guy, what you can bring to the table as birth control is a condom..

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It leaves microscopic gaps that the PTFE fill to make it sharper and have less drag. Way overkill for a knife to be that sharp, but it demonstrates it. I throw them out when they still the sharper than a new box cutter blade. I also agree that a Christian who does not love someone for any reason is not acting or loving as Jesus instructed them to love. Loving however does not always mean agreeing. Many loving Christians lovingly adhere the texts in the Bible in regards to homosexuality and other sins.

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SpaceX Falcon 9 launch: How to watch CRS-19 mission to the space station - CNET

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You don't want to miss this.
          

SpaceX’s Starship Craft For Space Exploration Blows Its Top During Test

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The top of SpaceX’s Mk 1 Starship appears to have blown off during a pressure test of the prototype rocket.
          

Ілон Маск представив Cybertruck - електричний пікап, схожий на брутальний бетмобіль (фото)

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Ілон Маск представив Cybertruck - електричний пікап, схожий на брутальний бетмобіль (фото)

Кузов машини складається з міцної сталі і виконує роль рами. Маск розповів, що кузов досить міцний, щоб витримати влучення кулі дев'ятиміліметрового калібру. Для дверей використовується той же куленепробивний сплав, що і для шатлів SpaceX. Але ударостійкість скла ще допрацьовується. Як і інші автомобілі Tesla, Cybertruck отримав систему адаптивного круїз-контролю Autopilot. Крім того, автомобіль оснащений адаптивною пневматичною підвіскою, що дозволяє підлаштовувати висоту кожної осі під навантаження.

Ілон Маск представив Cybertruck - електричний пікап, схожий на брутальний бетмобіль (фото)

Автомобіль буде поставлятися в трьох версіях з одним, двома або трьома моторами. При цьому всі версії будуть повноприводними. Акумулятори Cybertruck дозволяють пікапу проїхати на одному заряді 402, 483 або 805 миль, в залежності від версії. Старша версія пікапа зможе розганятися до 96,6 кілометрів на годину (60 миль в годину) за 2,9 секунди. Вартість автомобіля складає 39,9, 49,9 або 69,9 тисячі доларів, в залежності від версії. Виробництво пікапів почнеться в кінці 2021 року.

Ілон Маск представив Cybertruck - електричний пікап, схожий на брутальний бетмобіль (фото)
Ілон Маск представив Cybertruck - електричний пікап, схожий на брутальний бетмобіль (фото)
Ілон Маск представив Cybertruck - електричний пікап, схожий на брутальний бетмобіль (фото)
Ілон Маск представив Cybertruck - електричний пікап, схожий на брутальний бетмобіль (фото)
Ілон Маск представив Cybertruck - електричний пікап, схожий на брутальний бетмобіль (фото)
Ілон Маск представив Cybertruck - електричний пікап, схожий на брутальний бетмобіль (фото)
          

Elon Musk’s Starlink Satellites Are Already Causing a Headache for Astronomers

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Astronomers at a Chilean observatory were rudely interrupted earlier this week when a SpaceX satellite train consisting of 60 Starlink satellites drifted overhead, in what scientists are apparently going to have to accept as the new normal. Launched into orbit on November 11, the Starlink smallsat train took five minutes to pass over the Cerro Read more about Elon Musk’s Starlink Satellites Are Already Causing a Headache for Astronomers[…]
          

SpaceX Starship Mk1 explodes during cryogenic loading test

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SpaceX’s first full-scale Starship prototype – Mk1 – has experienced a failure at its Boca Chica test site in southern Texas. The failure occurred late in the afternoon on Wednesday, midway through a test of the vehicle’s propellant tanks. As of a few weeks ago, the Mk1 Starship – which was shown off to the Read more about SpaceX Starship Mk1 explodes during cryogenic loading test[…]
          

SpaceX Falcon 9 launch: How to watch CRS-19 mission to the space station - CNET

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You don't want to miss this.
          

SpaceX, Maxar, and Nanoracks to Demo Orbital Space Station Construction in 2020

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Space stations are expensive, but can we fix that? Yes, we can! (If this mission goes right.)
          

¡Cazada! La Tesla Cybertruck ya se pasea en silencio por las carreteras californianas

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¡Cazada! La Tesla Cybertruck ya se pasea en silencio por las carreteras californianas

Tan solo unos días después de su presentación y suscitar gran controversia por su polémica carrocería, la Tesla Cybertruck ya ha sido cazada en vídeo rodando en carreteras abiertas al tráfico, concretamente en los aledaños de los cuarteles de SpaceX, la compañía aeroespacial fundada y dirigida por Elon Musk, en Hawthorne (California, EEUU).

Las imágenes, obtenidas y difundidas por un usuario de Instagram, permiten apreciar las prominentes dimensiones del vehículo y su diseño disruptivo con lo visto hasta ahora, una combinación que lo hace identificable rápidamente a golpe de vista. Cabe recordar que la pick-up eléctrica de la firma de Palo Alto mide 5,88 metros de largo por 2,03 m de ancho y 1,90 m de alto.

En el vídeo, a pesar de su escasa duración, puede observarse a la camioneta acelerando e incluso adelantando a otro coche, seguida de un Tesla Model X, por lo que todo apunta a que se trata de alguna suerte de prueba desarrollada por la marca a pesar de que esta no se ha pronunciado (como es lógico) al respecto.

Tampoco sería descartable que se tratase de una nueva maniobra de marketing Elon Musk y su séquito para mantener a la Cybertruck unos días más en el ojo mediático, máxime a tenor de su éxito comercial en los primeros días. Según el ejecutivo californiano, la firma ya ha recibido más de 250.000 reservas en apenas cinco días, previo pago de un depósito reembolsable de 100 dólares.

Además, la hipótesis de que se tratase de un nuevo movimiento comercial cobra aún más sentido teniendo en cuenta que Tesla no tiene previsto llevar su pick-up cero emisiones a producción hasta finales de 2021. Algo que, no obstante, no parece disipar las esperanzas de posibles futuros compradores como la Policía de Dubai, que ya especula con tener una en su flota incluso antes de que llegue a las líneas de montaje.

Tesla Pick Up 011

En cualquier caso, no es la primera vez que un modelo de Tesla es fotografiado en la calzada antes de tiempo, pues algo similar ocurrió el pasado mes de octubre con el SUV eléctrico Model Y, que fue inmortalizado haciendo pruebas en California y Washington, así como a bordo de un camión repleto de unidades que circulaba por Fremont, California.

Tesla Cybertruck: tres versiones y desembarco en 2021

Tesla Pick Up Remolque

Resulta importante recordar que la Tesla Cybertruck llegará al mercado en tres versiones. Las primeras en hacerlo serán las variantes con dos y tres motores, denominadas Dual Motor y Tri Motor y capaces de conceder una autonomía de 483 km y 805 km, respectivamente.

Ambas envían la fuerza a las cuatro ruedas gracias a los propulsores situados en ambos ejes y serán capaces de completar el 0-96 km/h en 4,5 segundos y 2,9 segundos, mientras que la fuerza de remolque del tope de gama se cifra en unas sensacionales 6,3 toneladas, superando a la prestigiosa Ford F-150 (5.987 kg). Los precios base serán de 49.000 y 69.000 dólares.

Por su parte, la Tesla Cybertruck más económica, la Single Motor, contará con un único propulsor eléctrico y tracción trasera, y podrá pasar de 0 a 96 km/h en 6,5 segundos así como alcanzar una velocidad máxima de 177 km/h. Su precio partirá desde 39.900 dólares.

Una vez aterrice en el mercado, rivalizará con la Rivian R1T, la variante eléctrica de la F-150 que Ford ha prometido "estará lista en pocos años", y el modelo cero emisiones de General Motors, entre otras.

En Motorpasión | Así era la descomunal Ford F-250 Super Chief, la pick-up con nombre de locomotora que usaba hasta tres combustibles para moverse | Sí, habrá coches eléctricos baratos en Europa y no, no serán solo chinos

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La Tesla Cybertruck sacaría un 10 en seguridad según Musk, pero ¿podría siquiera superar las pruebas de choque en Europa?

La Tesla Cybertruck podría no ser segura para peatones ni ciclistas por su diseño, según el Euro NCAP australiano

Tesla Cybertruck: una pick-up eléctrica con 805 km de autonomía y más rápida que el Porsche 911 Carrera en el 0-96 km/h para 2021

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La noticia ¡Cazada! La Tesla Cybertruck ya se pasea en silencio por las carreteras californianas fue publicada originalmente en Motorpasión por David Galán .


          

SpaceX Mk1 Starship взорвался во время испытаний

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Первый полномасштабный опытный прототип космического корабля Mk1 Starship компании SpaceX взорвался во время испытаний на полигоне в Бока Чика (Техас). Компания заявила, что «результат не стал абсолютной неожиданностью».
          

Test Specialist Dragon Ground Operations - Space Exploration Technologies - Cape Canaveral, FL

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TEST SPECIALIST DRAGON GROUND OPERATIONSTest specialists work closely with the SpaceX Dragon Ground Operations engineering department in the design and development of electrical and fluid ground support equipment. As well as developing test fixtures equipment...
          

No Drones in US Gov, Google Buys FitBit, Edge in Linux, James Dean is Back - The Category5.TV Newsroom - Episode 632

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The Category5.TV Newsroom

Here are the stories we're covering this week: - The US Interior Department is grounding its entire drone fleet for fear it could be used against them. - Microsoft Edge is coming to Linux. - The late James Dean is getting digitally restored for an upcoming movie — and many on the internet, including Chris Evans, aren’t happy. - NASA scientists opened an untouched rock and soil sample from the Moon returned to Earth on Apollo 17, marking the first time in more than 40 years a pristine sample from the Apollo era has been opened. Honorable Mentions: - Google is buying Fitbit – and promises that they will not exploit all that health data to serve ads. - SpaceX Falcon 9 rocket deployed 60 Starlink satellites into earth’s orbit Monday. - Google is attempting to combat the growing Play Store malware issue and has formed the “App Defense Alliance” which brings technology from ESET, Lookout and Zimperium to the Play Store - you’ll notice now if you install an app, it gets scanned first.

Read the complete show notes, comment or rate this episode, view pictures and obtain links from this episode at https://category5.tv/shows/newsroom/episode/632/

Running time: 44 Minutes 46 Seconds


          

Tesla Cybertruck Unveil, SpaceX Starship Explosion, and More - Ep 61

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Joe, Tim, and Ben talk about Tesla's Cybertruck unveil event, a Starship test accident, and more.


Links: 

Tesla Cybertruck - http://www.tesla.com/cybertruck

Starship Explosion -https://twitter.com/LabPadre/status/1197267227797573633

Why Don't They Just Design Tweak: https://twitter.com/pete_twdy/status/1197930199184289793

Why Don't They Just Inflatable Tent: https://twitter.com/astrav/status/1197830758120984576




          

Episode 597: Q&A 108: Why Are There Meteor Showers Every Year? And More, Featuring Paul Geithner from JWST

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In this week's questions show, I explain why we can see meteor showers every year, why we're not 3D printing telescopes in space, why there aren't any plans to launch telescopes with SpaceX Starship. And a lengthy answer to one of the most common James Webb questions we get: can it be refueled? This was answered by Paul Geithner, a Deputy Project Manager for James Webb during a recent livestream. 01:00 Why do we see meteor showers every year? 02:49 Why not also use 3D printing for space telescopes? 04:40 Why don't they design telescopes for Starship? 07:20 Could there be a privately backed telescope? 09:54 Is there glass on the Moon to build telescopes? 11:46 Could ISS help build new space telescopes? 13:47 Space telescopes on the far side of the Moon? 15:06 Is Andromeda actually much closer? 16:27 Why spend money on science? 19:20 Why is the dark side of the Moon illuminated? 21:34 Can James Webb be refueled? Watch the full livestream here: https://www.youtube.com/watch?v=iX0iCqCTKzE Want to be part of the questions show? Ask a short question on any video on my channel. I gather a bunch up each week, and answer them here. Our Book is out! https://www.amazon.com/Universe-Today-Ultimate-Viewing-Cosmos/dp/1624145442/ Audio Podcast version: ITunes: https://itunes.apple.com/us/podcast/universe-today-guide-to-space-audio/id794058155?mt=2 RSS: https://www.universetoday.com/audio What Fraser's Watching Playlist: https://www.youtube.com/playlist?list=PLbJ42wpShvmkjd428BcHcCEVWOjv7cJ1G Weekly email newsletter: https://www.universetoday.com/newsletter Weekly Space Hangout: https://www.youtube.com/channel/UC0-KklSGlCiJDwOPdR2EUcg/ Astronomy Cast: https://www.youtube.com/channel/UCUHI67dh9jEO2rvK--MdCSg Support us at: https://www.patreon.com/universetoday More stories at: https://www.universetoday.com/ Twitch: https://twitch.tv/fcain Follow us on Twitter: @universetoday Like us on Facebook: https://www.facebook.com/universetoday Instagram - https://instagram.com/universetoday Team: Fraser Cain - @fcain / frasercain@gmail.com Karla Thompson - @karlaii / https://www.youtube.com/channel/UCEItkORQYd4Wf0TpgYI_1fw Chad Weber - weber.chad@gmail.com
          

Episode 596: Open Space 54: Dr. Casey Handmer On How Starship Changes Everything

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Today I was joined by Dr. Casey Handmer, an accomplished theoretical physicist who currently works at NASA's Jet Propulsion Lab. Casey has a fascinating blog where he considers current trends in space exploration and what the future holds. Learn more about Casey here: https://caseyhandmer.wordpress.com/ We talked about the implications of SpaceX Starship, Starlink, why power beamed from space or asteroid mining will never turn a profit down here on Earth, and why he's not that scared about space radiation. Our Book is out! https://www.amazon.com/Universe-Today-Ultimate-Viewing-Cosmos/dp/1624145442/ Audio Podcast version: ITunes: https://itunes.apple.com/us/podcast/universe-today-guide-to-space-audio/id794058155?mt=2 RSS: https://www.universetoday.com/audio What Fraser's Watching Playlist: https://www.youtube.com/playlist?list=PLbJ42wpShvmkjd428BcHcCEVWOjv7cJ1G Weekly email newsletter: https://www.universetoday.com/newsletter Weekly Space Hangout: https://www.youtube.com/channel/UC0-KklSGlCiJDwOPdR2EUcg/ Astronomy Cast: https://www.youtube.com/channel/UCUHI67dh9jEO2rvK--MdCSg Support us at: https://www.patreon.com/universetoday More stories at: https://www.universetoday.com/ Twitch: https://twitch.tv/fcain Follow us on Twitter: @universetoday Like us on Facebook: https://www.facebook.com/universetoday Instagram - https://instagram.com/universetoday Team: Fraser Cain - @fcain / frasercain@gmail.com Karla Thompson - @karlaii / https://www.youtube.com/channel/UCEItkORQYd4Wf0TpgYI_1fw Chad Weber - weber.chad@gmail.com
          

Episode 594: Building Space Telescopes... In Space

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When it comes to telescopes, bigger is better. That’s true down here on Earth, and it’s especially true out in space. As astronomers and engineers design the next generation of giant space telescopes, they’re running up against the limits of current launch providers. There are only so many ways you can fold a huge telescope to get it to fit inside a 5-meter launch fairing. The upcoming James Webb Space Telescope is pretty much the very limit of what you can construct on Earth and put into space in a single launch. To go bigger, space agencies will need to consider assembling their next-generation space telescopes… in space. Our Book is out! https://www.amazon.com/Universe-Today-Ultimate-Viewing-Cosmos/dp/1624145442/ Audio Podcast version: ITunes: https://itunes.apple.com/us/podcast/universe-today-guide-to-space-audio/id794058155?mt=2 RSS: https://www.universetoday.com/audio What Fraser's Watching Playlist: https://www.youtube.com/playlist?list=PLbJ42wpShvmkjd428BcHcCEVWOjv7cJ1G Weekly email newsletter: https://www.universetoday.com/newsletter Weekly Space Hangout: https://www.youtube.com/channel/UC0-KklSGlCiJDwOPdR2EUcg/ Astronomy Cast: https://www.youtube.com/channel/UCUHI67dh9jEO2rvK--MdCSg Support us at https://www.patreon.com/universetoday More stories at https://www.universetoday.com/ Twitch: https://twitch.tv/fcain Follow us on Twitter: @universetoday Like us on Facebook: https://www.facebook.com/universetoday Instagram - https://instagram.com/universetoday Team: Fraser Cain - @fcain / frasercain@gmail.com Karla Thompson - @karlaii / https://www.youtube.com/channel/UCEItkORQYd4Wf0TpgYI_1fw Chad Weber - weber.chad@gmail.com References: https://hubblesite.org/mission-and-telescope http://herschel.cf.ac.uk/mission/launch https://exoplanets.nasa.gov/exep/technology/in-space-assembly/iSATstudy/ https://www.nasa.gov/missionpages/station/structure/elements/space-station-assembly https://blogs.nasa.gov/spacex/2019/07/29/cargo-dragon-berthed-to-station/
          

SpaceX’s First Prototype Fails to Launch

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In an unfortunate incident, the first launch of the SpaceX’s Starship prototype failed miserably. The video surfaced on the internet shows the failure of the highly anticipated event. The video shows that the top portion of the spacecraft broke off during the launch. As a result, the launch could not be completed. Once the top […]
          

Comment on A Closer Look at an Interstellar Comet by James Jason Wentworth

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"Short-range starships" (those words kept sounding in my mind as I read this update--and especially, your comment about the great difficulty of even achieving fast, "particles-grabbing" [and/or quick-scan] flybys of these visitors). Chemical rockets are pitifully inadequate (for really worthwhile missions to these objects), and ion drives and HETs [Hall effect thrusters], while they have the ISP for the job--although not by large margins--accelerate so slowly that having such probes in the right place at the right time to intercept or rendezvous seems like a perversely frustrating game that a Pan or a Loki might devise... But: Looking around, there *are* existing propulsion technologies that could get worthwhile instrument packages out to these objects, even to "land" (rendezvous and dock) on them and return actual samples to Earth. But one is still at a rather low technological maturity level, although the "engine" it would use--our Sun--already exists and is ready to be engaged (for one-way missions), whenever we are. The other could be built today, but it would have to be built--and launched--in/from areas of the world where the "No nukes in space...!" (or anywhere else) luddites would be afraid to go (and wouldn't be allowed in, in any event). It's frustrating to know what we *could* do, and that it is stymied by ignorance-based fear. The engineering--and even actual designs--have long been ready, though; for example: A "small" Orion nuclear pulse spaceship, with a pusher plate "just" 33 feet (10 meters) in diameter, was designed for launch aboard a Saturn V (its first two stages, the S-IC and the S-II). As with Skylab in May of 1973, those two stages would have injected the Orion vehicle into low Earth orbit. Once there, its high-thrust ^and^ high-specific impulse (a rare combination, as one must usually choose one over the other) nuclear "shaped charge" pulse units--designed to ensure that fully half of the high-velocity bomb debris, including the forward-directed (by a nozzle in each pulse unit bomb assembly) vaporized polyethylene, intercepted the pusher plate--would start firing, and: While this Saturn V-lofted Orion spaceship was likely intended for interplanetary travel (I haven't seen its specifications for some years), and thus utilized fission pulse units, the Orion team also designed starships (capable of reaching about 0.1 c, enabling a voyage to Alpha Centauri--as long as one didn't need to slow down!--that could take less than fifty years), which used thermonuclear (fusion bomb) pulse units. Plus: With the advances in fusion bomb design (including weapon miniaturization) that have occurred since Project Orion was shelved about half a century ago, today we could build smaller, lighter, 0.5% - 10% of light velocity cruising speed (and maybe more) Orion starprobes, which could reach the interstellar interlopers *and* return after reasonable intervals of time (0.5% - 1% of c should be amply fast for such missions), carrying generous samples as well as enormous quantities of data. It might be cheaper--as Arthur C. Clarke speculated concerning automatic interstellar probes--for such interstellar interloper probes to come back than to transmit such prodigious quantities of data back to Earth by radio or even laser, at least until/unless we have huge radio and/or optical telescopes in space and/or on the Moon. As well: Elon Musk's SpaceX is developing the Super Heavy (rocket)/Starship (a general-purpose upper stage/two-way shuttle/small-payload SSTO--Single-Stage-To-Orbit--interplanetary spaceship with in-space refueling capability) combination. With the Super Heavy first stage, this vehicle combination has an in-orbit payload mass capability, even initially, that is considerably greater than the Saturn V's (220,000 pounds [100,000 kilograms] initially, with a target of 150,000 kilograms). The Super Heavy/Starship, once it is flying, will be able to loft actual starships of the Orion type (at least robotic ones, for now) into Earth orbit, from which they can begin their long ultraplanetary (to meet interstellar interlopers)--and ultimately, interstellar--journeys.
          

Who is leading the private space race?

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  • The International Space Station is the most expensive public project ever built in the history of humanity.
  • Companies like NanoRacks, SpaceX, and Blue Origin have already entered the conversation of what the future will look like for the ISS.
  • Now, it's important to entertain only the serious contenders in the space race.

          

Apple ❤️ Trump ? • Porno VR à la carte • Tesla Cybertruck !

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SSmap episode #201

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After a slower launch year—by its standards—SpaceX plans a busy December

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The launch activity will begin as early as Wednesday.
          

Гледайте на живо мисията CRS-19 на ракетата SpaceX Falcon 9

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Изстрелванията на ракети SpaceX се случват толкова често, че вече изгледат доста рутинни, но въпреки това, все още представляват събития, които си заслужава да бъдат гледани, особено ако сте любител на Космоса. Най-новият бустер Falcon 9 е планиран да изстреля капсулата Dragon, носеща научни полезни товари и шепа CubeSats на НАСА, директно към Международната космическа […]

Материалът Гледайте на живо мисията CRS-19 на ракетата SpaceX Falcon 9 е публикуван за пръв път на kaldata.com.




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