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          Segnali da una lontana galassia registrati dall'intelligenza artificiale      Cache   Translate Page      



L'intelligenza artificiale in ascolto dei segnali prodotti dall'universo violento in cerca di quelli che potrebbero avere un'origine artificiale (fonte: Breakthrough Listen image) © Ansa


L'intelligenza artificiale si mette in cerca di Et: è un'idea del programma Breakthrough Listen, nato nell'ambito del progetto Seti per la ricerca sulle intelligenze extraterrestri, e punta ad analizzare in modo più efficiente i segnali radio prodotti dalle grandi esplosioni cosmiche in cerca di anomalie che potrebbero avere un'origine artificiale. Descritto sull'Astrophysical Journal, il progetto è coordinato da Andrew Siemion, direttore del Seti. Il banco di prova del sistema di intelligenza artificiale in ascolto di Et è stata l'analisi dei segnali radio provenienti dalla sorgente chiamata FRB 121102, che si trova in una galassia distante circa 3 miliardi di anni luce dalla Terra.
I lampi radio veloci (fast radio burst, Frb) sono impulsi radio che durano millesimi di secondo, generati in galassie molto lontane e la cui sorgente non è chiara.
I ricercatori si sono concentrati sulla sorgente FRB 121102 perché è molto particolare: è una delle poche a generare questi segnali periodicamente; per la maggior parte li produce solo una volta. Il sistema di intelligenza artificiale ha analizzato i segnali provenienti da questa fonte nell'arco di cinque ore,registrati  il 26 agosto 2017 dal Green Bank Telescope, in West Virginia. Il sistema ha individuato in questo modo 71 nuovi eventi, portando a 300 il numero dei segnali registrati complessivamente da questa fonte dal 2012. Si è visto inoltre che i segnali vengono prodotti in modo irregolare e che la sorgente alterna periodi di quiescenza a periodi di attività frenetica.
Secondo Siemion, l'analisi potrebbe finalmente rivelare l'origine di questi segnali. Anche se si scoprisse che "non sono la firma di una tecnologia extraterrestre, il progetto Breakthrough Listen avrebbe comunque gettato le basi di una nuova area di ricerca" che applica l'intelligenza artificiale alla radioastronomia e "che aiuterà a comprendere l'universo".

Fonte 

 


          Neil deGrasse Tyson on Elon Musk, Trump's Space Force      Cache   Translate Page      
Astrophysicist and TV host Neil deGrasse Tyson discusses business opportunities that outer space offers, Tesla CEO Elon Musk's recent behavior, and Trump's new branch of the military, the Space Force.
          Neil DeGrasse Tyson on Elon Musk: 'Let the man be an individual' - CNBC      Cache   Translate Page      

CNBC

Neil DeGrasse Tyson on Elon Musk: 'Let the man be an individual'
CNBC
Tesla and Space X CEO Elon Musk should be allowed to just be himself, noted astrophysicist Neil deGrasse Tyson told CNBC on Wednesday. Musk has come under scrutiny for his recent behavior, which includes his controversial tweet about taking Tesla ...
Neil deGrasse Tyson on Elon Musk Smoking Weed: 'Let the Man Get High'Newsweek
Neil deGrasse Tyson's “Accessory to War”: Where “space scientists and space warriors” collideSalon

all 13 news articles »

          #4: Accessory to War: The Unspoken Alliance Between Astrophysics and the Military      Cache   Translate Page      
Accessory to War
Accessory to War: The Unspoken Alliance Between Astrophysics and the Military
Neil deGrasse Tyson , Avis Lang
3.5 out of 5 stars(3)
Release Date: September 11, 2018

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          Aurélien Barrau, le scientifique qui défend l’écologie      Cache   Translate Page      
Cet astrophysicien est à l’origine de la tribune signée par 200 personnalités dans « Le Monde » appelant les politiques à faire face au changement climatique.
          "Accessory to War": Neil deGrasse Tyson talks militarization of space      Cache   Translate Page      
Could a sixth "space force" military branch actually be necessary, as President Trump has called for? The Pentagon says it will help accelerate space technology and advance America's scientific knowledge. Astrophysicist Neil deGrasse Tyson joins "CBS This Morning" to discuss his new book, "Accessory to War: The Unspoken Alliance Between Astrophysics and the Military," which examines the militarization of space.
          Neil DeGrasse Tyson on Elon Musk: 'Let the man be an individual'      Cache   Translate Page      
 Astrophysicist Neil deGrasse Tyson tells CNBC Musk should be left alone.
          ADIOS Amigos Free Download PC Games      Cache   Translate Page      
ADIOS Amigos Free Download PC Game Cracked in Direct Link and Torrent. ADIOS Amigos A game with serious astrophysics in a comic setting for 1-4 players. ADIOS Amigos PC Game Overview: ADIOS Amigos is developed and published by Cosmic Picnic. It was released in 12 Sep, 2018. Team up with your friends and family and…
          On This Day in Math - September 13      Cache   Translate Page      

Proof is the idol before whom the pure mathematician tortures himself.
~Sir Arthur Eddington


The 256th day of the year; 256 is the smallest composite to composite power,44.

Paul Erdos conjectured that no power of 2 is the sum of distinct powers of three.

from jim wilder @ wilderlab √256 = 2 • 5 + 6

The sum of the cubes of the first 256 odd numbers is a perfect number. \( \sum\limits_{i=0}^{255} (2i+1)^3 = 8589869056\) the 6th perfect number. (all perfect numbers (except 6) are the sum of the cubes of first 2n odd cubes for some (but not all) n) (so \( 28 = 1^3 + 3^3\) and \( 496=1^3 + 3^3 + 5^3 + 7^3\)  ).

256 is the middle number in a run of three successive numbers which are all constructible regular n-gons. 255= 3*5*17, is the product of distinct Fermat Primes, 256=28 and is a power of two, and 257 is a Fermat Prime. *HT to Don S. McDonald ‏@McDONewt


EVENTS

1763 Christopher Irwin’s marine chairs were loaded onto the Princess Louisa to head off to Barbados. Irwin’s chair was being tested alongside Tobias Mayer’s lunar tables and John Harrison’s sea watch.
On 13 September 1763, the log of Lieutenant Patrick Fotheringham records how the ship “Came alongside a Hoy with two Marine Chairs and apparatus for observing the Planet Jupiter in order to finding yet Longde. at Sea the Commissioners for ye Discovery to examine these Machines under ye Direction of Adml. Tyrrell in ye course of his Voyage; Do. came on Bd Mr. Christopher Erwin the Inventor of ye Marine Machine”. *Board of Longitude project, Greenwich

1789 Wm. Herschel writes to Wollaston, "I have found that Saturn has a satellite which has hitherto escaped our observation...".
* buffalolib.org 

Francis Wollaston (23 November 1731, London – 31 October 1815) was an English priest and astronomer.He achieved some distinction as an astronomer, becoming a member of the Royal Society in 1769 and later serving on its council. He also produced a catalog of stars and nebulae in 1789, which was used by many including his friend, William Herschel, about which he comments near the bottom of the letter.

1844 The term ABELIAN INTEGRAL is found in a letter of Sept. 8, 1844, from William Henry Fox Talbot: "What is the definition of an Abelian Integral? for it appears to me that most integrals possess the Abelian property." The letter was addressed to John Frederick William Herschel, who, in his reply of Sept. 13, 1844, wrote: "I suppose the most general definition of an Abelian Integral might be taken to be this that between ∫(x) and ∫(φ(x)) there shall subsist an algebraical relation between several such functions."  As a postscript, he adds that "a very curious photographic novelty occurred to me a day or 2 ago" in which he describes how to use a negative to create a positive image.(Talbot's original contributions included the concept of a negative from which many positive prints can be made (although the terms negative and positive were coined by Herschel), and the use of gallic acid for developing the latent image. [The Talbot letters are available here. ] *Jeff Miller Web site & Wik

1883 Opening of the University of Texas at Austin and Galveston. *VFR

1890 Scientific American carried an article featuring the latest writing technology for the classroom, a slate pen-tip eraser. The device, invented by Mrs Emma Hudson, nestled a piece of sponge inside a rubber casing which could be wetted to remove some, or all, of the marks on a student slate. (The first pencil tip eraser for a lead pencil had been invented in 1858.)


1955 Minor Planet (3167) Babcock 1955 RS. Discovered 1955 September 13 at the Goethe Link Observatory at Brooklyn, Indiana. Named in memory of Harold D. Babcock (1882-1968) and in honor of his son Horace W. Babcock, (on whose birthday it was discovered, see BIRTHS below) astronomers at Mount Wilson Observatory, the latter also serving as director of Palomar Observatory. The elder Babcock's precise laboratory studies of atomic spectra allowed others to identify the first "forbidden" lines in the laboratory and to discover the rare isotopes of oxygen. With C. E. St. John and others, he extended Rowland's tables of the solar spectrum into the ultraviolet and infrared. The Babcocks ruled excellent large gratings, including those used in the coudé spectrographs of the 2.5-m and 5-m telescopes, and they measured the distribution of magnetic fields over the solar surface to unprecedented precision. The younger Babcock invented and built many astronomical instruments, including the solar magnetograph, microphotometers and automatic guiders. By combining his polarization analyzer with the spectrograph he discovered magnetic fields in other stars, and he developed important models of sunspots and their magnetism. (M 15089) Name proposed by F. K. Edmondson. *NSEC

1959 Lunik II hit the moon, being the first man-made object to do so.In 1959, the first space probe to strike the moon was the Soviet Luna 2, which crashed east of the Sea of Serenity. Thirty-six hours after its launch, it was the first man-made object to reach a celestial body. *TIS On September 15, 1959, the premier of the USSR, Nikita Khrushchev, presented to the American president Dwight D. Eisenhower a copy of the spherical pennant (used onboard the Luna 2) as a gift. That sphere is located at the Eisenhower Presidential Library and Museum in Abilene, Kansas.*Wik The actual time of collision was September 13, 1959, 21:02:24 UTC

1983 Osborne Computer declares bankruptcy, two years after producing the first portable computer, the 24-pound Osborne I. Designed by company founder Adam Osborne, the \($1,795\) machine included software worth about \($1,500\). The machine featured a 5-inch display, 64 kilobytes of memory, a modem, and two 5 1/4-inch floppy disk drives.
In April 1981, Byte Magazine Editor-in-Chief Chris Morgan mentioned the Osborne I in an article on Future Trends in Personal Computing. He wrote: I recently had an opportunity to see the Osborne I in action. I was impressed with it's compactness: it will fit under an airplane seat. (Adam Osborne is currently seeking approval from the FAA to operate the unit on board a plane.) One quibble: the screen may be too small for some people's taste.*CHM

2007 Closing date for a prize for a solution to Fermat’s last theorem. Due to inflation the prize of one hundred thousand marks has long been worthless.*VFR (perhaps not completely worthless.) In 1908 The academy of sciences of Gottingen announced a prize of one hundred thousand marks, according to the will of Dr. Paul Wolfskehl, of Darmstadt, for the proof of Fermat’s great theorem. A German industrialist and amateur mathematician, Wolfskehl bequeathed 100,000 marks to the Göttingen Academy of Sciences to be offered as a prize for a complete proof of Fermat's Last Theorem. On 27 June 1908, the Academy published nine rules for awarding the prize. Among other things, these rules required that the proof be published in a peer-reviewed journal; the prize would not be awarded for two years after the publication; and that no prize would be given after 13 September 2007, roughly a century after the competition was begun. Wiles collected the Wolfskehl prize money, then worth $50,000, on 27 June 1997.
Prior to Wiles' proof, thousands of incorrect proofs were submitted to the Wolfskehl committee, amounting to roughly 10 feet (3 meters) of correspondence. In the first year alone (1907–1908), 621 attempted proofs were submitted, although by the 1970s, the rate of submission had decreased to roughly 3–4 attempted proofs per month. According to F. Schlichting, a Wolfskehl reviewer, most of the proofs were based on elementary methods taught in schools, and often submitted by "people with a technical education but a failed career". In the words of mathematical historian Howard Eves, "Fermat's Last Theorem has the peculiar distinction of being the mathematical problem for which the greatest number of incorrect proofs have been published."*Wik



BIRTHS

1873 Constantin Caratheodory born. (13 Sep 1873; 2 Feb 1950) He worked on the calculus of variations and the theory of real functions. He is the only modern Greek mathematician “who does not suffer by comparison with the famous names of Greek antiquity.” *VFR.
German mathematician of Greek origin who made important contributions to the theory of real functions and to the theory of point-set measure. He demonstrated that the calculus of variations (the theory of maxima and minima in curves) could be applied not just to smooth curves, but also those with corners. He also contributed to thermodynamics and helped develop Einstein's special theory of relativity. *TIS

1885 Wilhelm Blaschke  (13 Sep 1885; 17 Mar 1962) German mathematician whose major contributions to geometry concerned kinematics and differential geometry. Kinetic mapping (important later in the axiomatic foundations of various geometries) he both discovered and established it as a tool in kinematics. He also initiated topological differential geometry (the study of invariant differentiable mappings)*TIS

1912 Horace Welcome Babcock (13 Sep 1912; 29 Aug 2003) was a American astronomer, son of Harold Babcock. Working together, they were the first to measure the distribution of magnetic fields over the surface of the Sun. Horace invented and built many astronomical instruments, including a ruling engine which produced excellent diffraction gratings, the solar magnetograph, and microphotometers, automatic guiders, and exposure meters for the 100 and 200-inch telescopes. By combining his polarizing analyzer with the spectrograph he discovered magnetic fields in other stars. He developed important models of sunspots and their magnetism, and was the first to propose adaptive optics.*TIS

1913 Herman Heine Goldstine (September 13, 1913 – June 16, 2004), mathematician, computer scientist and scientific administrator, was one of the original developers of ENIAC, the first of the modern electronic digital computers.*Wik

1920 William Bowen Bonnor (September 13, 1920 - ) is a mathematician and gravitation physicist best known for his research into astrophysics, cosmology and general relativity. For most of his academic career he has been a professor of mathematics at the University of London.*Wik

1923 Peter K Henrici (13 Sept 1923 , 13 March 1987) He made "major contributions to preserving and enriching our mathematical heritage. His books and papers have helped greatly in maintaining numerical analysis as a subject with beauty, order, and structure, in the spirit of the great pioneers of the past. He keeps reminding us to ask what Gauss would have done with a parallel computer - or with a pocket calculator."
"Henrici was truly an internationally recognized numerical analyst, having written 11 books and over 80 research papers. A very cultured person who was also a gifted pianist, he was an outstanding teacher particularly interested in helping younger mathematicians. His lectures showed great polish and inspired many. His guidance and unselfish contributions as an editor have helped make Numerische Mathematik the respected journal it is. For this alone, we owe him a great debt of gratitude." *SAU

1926 Sidney David Drell (born September 13, 1926, Atlantic City) is an American theoretical physicist and arms control expert. He is a professor emeritus at the Stanford Linear Accelerator Center (SLAC) and a senior fellow at Stanford University's Hoover Institution. Drell is a noted contributor in the field of quantum electrodynamics and particle physics. The Drell–Yan process is partially named after him. He was one of the winners of the 2000 Enrico Fermi Award.*Wik



DEATHS

1296 Johannes Campanus (1220 in Novara, Italy - 13 Sept 1296 in Viterbo, Italy) also known as Campanus of Novara, was an Italian mathematician who published a Latin edition of Euclid's Elements. He also wrote on astronomy.*SAU

1940 Myron Mathisson (15 Dec 1897 , 13 Sept 1940) was a Polish Jew known for his work on the equations of motion of bodies in general relativity and for developing a new method to analyze the properties of fundamental solutions of linear hyperbolic differential equations. In particular, he derived the equations for a spinning body moving in a gravitational field and proved, in a special case, the Hadamard conjecture on the class of equations that satisfy the Huygens principle. His work still exerts influence on current research.*Cornell Univ Library


Credits :
*CHM=Computer History Museum
*FFF=Kane, Famous First Facts
*NSEC= NASA Solar Eclipse Calendar
*RMAT= The Renaissance Mathematicus, Thony Christie
*SAU=St Andrews Univ. Math History
*TIA = Today in Astronomy
*TIS= Today in Science History
*VFR = V Frederick Rickey, USMA
*Wik = Wikipedia
*WM = Women of Mathematics, Grinstein & Campbell
          #7: Accessory to War: The Unspoken Alliance Between Astrophysics and the Military      Cache   Translate Page      
Accessory to War
Accessory to War: The Unspoken Alliance Between Astrophysics and the Military
Neil deGrasse Tyson , Avis Lang
3.5 out of 5 stars(3)

Buy new: $30.00 $17.99
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          Neil deGrasse Tyson: The Unspoken Alliance Between Astrophysics and the Military      Cache   Translate Page      

Neil deGrasse Tyson, director of the Hayden Planetarium at the New York Museum of Natural History and the author of 'Accessory to War: The Unspoken Alliance Between Astrophysics and the Military' describes his realization that, despite the tendency for members of the space sciences to lean anti-war, there has long been a connection between their…

link: Neil deGrasse Tyson: The Unspoken Alliance Between Astrophysics and the Military


          Neil DeGrasse Tyson on Elon Musk: 'Let the man be an individual' - CNBC      Cache   Translate Page      

CNBC

Neil DeGrasse Tyson on Elon Musk: 'Let the man be an individual'
CNBC
Tesla and Space X CEO Elon Musk should be allowed to just be himself, noted astrophysicist Neil deGrasse Tyson told CNBC on Wednesday. Musk has come under scrutiny for his recent behavior, which includes his controversial tweet about taking Tesla ...
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all 215 news articles »

          Neil deGrasse Tyson on Elon Musk, Trump's Space Force      Cache   Translate Page      
Astrophysicist and TV host Neil deGrasse Tyson discusses business opportunities that outer space offers, Tesla CEO Elon Musk's recent behavior, and Trump's new branch of the military, the Space Force.
          #6: Accessory to War: The Unspoken Alliance Between Astrophysics and the Military      Cache   Translate Page      
Accessory to War
Accessory to War: The Unspoken Alliance Between Astrophysics and the Military
Neil deGrasse Tyson , Avis Lang
3.5 out of 5 stars(3)
Release Date: September 11, 2018

Buy new: $30.00 $17.99
102 used & new from $14.75

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          Magnetic explosions: role of the inductive electric field      Cache   Translate Page      
Дата и время публикации : 2012-02-07T07:43:35Z Авторы публикации и институты : D. B. Melrose Ссылка на журнал-издание: Astrophysical Journal 748 (March 20, 2012)Коментарии к cтатье: Ссылка на журнал-издание не найденаПервичная категория: astro-ph.SR Все категории : astro-ph.SR Краткий обзор статьи: Inclusion of the inductive electric field, ${bf E}_{rm ind}$ due to the temporally changing ${bf B}$, [...]
          Sind unsere Tage gezählt? Stephen Hawking machte eine erschütternde Vorhersage      Cache   Translate Page      

Vom verstorbenen Physiker Stephen Hawking bleiben nicht nur seine zahlreichen Studien zur Beschaffenheit unseres Universums und zu Schwarzen Löchern in Erinnerung. Hawking kommentierte immer wieder das aktuelle Weltgeschehen und scheute nicht vor mahnenden Worten. 

Hawking prophezeite uns eine düstere Zukunft, wenn wir auf der Erde bleiben. Der britische Wissenschaftler, der 2015 bei einer Debatte in Sydney per Hologramm-Technik zugeschaltet war, warnte dabei, dass es die Menschheit nicht mehr lange gebe, wenn sie die den blauen Planeten nicht bald verlasse.

Hawking erklärte, „für die Zukunft der Menschheit“ müsse der Weltraum weiter erforscht werden. Er „glaube nicht, dass wir weitere 1.000 Jahre überleben, wenn wir diesem zerbrechlichen Planeten nicht entkommen.“

„Wenn wir uns im Weltraum ausbreiten und dort Kolonien gründen, sollte unsere Zukunft sicher sein

mars rover nasaSchon in einem Radio-Interview mit BBC, in dem er über schwarze Löcher im Weltall sprach, zählte der Wissenschaftler die seiner Meinung nach drei größten Bedrohungen der Menschheit auf: Genetisch synthetisierte Viren, globale Klimaerwärmung und Atomkrieg. „Die Wahrscheinlichkeit einer Katastrophe auf dem Planeten Erde ist in diesem Jahr recht gering, wird aber mit der Zeit zunehmen. Es besteht also kein Zweifel darüber, dass dies in den nächsten 1.000 bis 10.000 Jahren geschehen wird“, so Hawking. Nur „wenn wir uns im Weltraum ausbreiten und dort Kolonien gründen, sollte unsere Zukunft sicher sein“. 

Der Mars wird hinsichtlich seiner Bewohnbarkeit bereits erforscht. Hawking zufolge reiche das jedoch nicht aus, man müsse auch in anderen Sonnensystemen nach erdähnlichen Planeten suchen. Er hoffte darauf, dass der technologische Fortschritt bald dazu führen werde, dass die Mittel für solche Missionen zur Verfügung stünden. 

Nach dieser düsteren Vorhersage beendete Hawking seine Rede mit einer Aufforderung, die ungelösten Geheimnisse des Universums weiter zu erforschen. „Denkt daran, zu den Sternen aufzusehen und nicht hinunter auf eure Füße. Versucht zu verstehen, was ihr da seht, fragt euch, warum das Universum existiert. Seid neugierig. Wie schwierig das Leben manchmal auch sein mag, es gibt immer etwas, das ihr tun und womit ihr erfolgreich sein könnt. Alles was zählt ist, dass ihr nicht einfach aufgebt.“

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          Forscher haben im Zentrum unserer Galaxie ein beängstigendes Objekt entdeckt      Cache   Translate Page      

Filament

Obwohl das Universum bereits seit Jahren erforscht wird, birgt es dank seiner unfassbaren Dimensionen noch immer Überraschungen für Astronomen. Eine solche Überraschung trat 2016 ein, als der Astronom Farhad Yusef-Zadeh von der Northwestern University in Chicago im Zentrum der Milchstraße eine ungewöhnliche Materienansammlung, auch Filament genannt, entdeckte.

Wie das Harvard-Smithsonian Center for Astrophysics berichtet, ist dieses Filament rund 2,3 Lichtjahre lang und zeigt nach einer Kurve auf das Schwarze Loch Sgr A* im Zentrum der Galaxie.

Forschern der University of California in Los Angeles gelang es nun, erstmals ein hochauflösendes Bild dieses Objektes aufzunehmen. „Mit unserem verbesserten Bild können wir dem Filament nun sehr viel näher an das Schwarze Loch im Zentrum der Galaxie folgen. Es weist darauf hin, dass das Filament daraus entsteht“, so Mark Morris, der die Forschungen in Los Angeles leitet. Es gäbe noch viel zu tun, um die wahre Herkunft des Filamentes zu bestimmen. Die Forscher liefern dennoch bereits drei Theorien über den Ursprung der Materienansammlung.

Filament könnte von superschnellen Teilchen verursacht werden

Die erste Theorie ist, dass das Filament von superschnellen Teilchen verursacht wird, die vom Schwarzen Loch weggeschleudert werden. Ein sich drehendes Schwarzes Loch, in das sich Gas schraubt, kann ein vertikales, sich rotierendes magnetisches Feld in Form eines Zylinders produzieren, der sich dem Ereignishorizont annähert oder sogar mit ihm verkettet. Innerhalb dieses Zylinders beschleunigen sich Teilchen und produzieren Radiostrahlung, während sie sich um die magnetischen Feldlinien drehen und vom Schwarzen Loch weg fliegen.

In der zweiten, deutlich aufregenderen Theorie ist dieses Filament ein kosmischer String. Dabei handelt es sich um ein theoretisches, sehr dünnes Objekt, das Masse und elektrische Ladung tragen kann. Ein solcher String wurde noch nicht entdeckt, Theoretiker nehmen jedoch an, dass sich kosmische Strings — sollten sie existieren — in Richtung Zentrum einer Galaxie bewegen. Wenn der String nah genug am Ereignishorizont ist, könnte das Objekt vom Schwarzen Loch verschlungen werden.

Filament könnte lediglich ein kosmischer Zufall sein

Die letzte Theorie der Astronomen ist, dass Position und Ausrichtung des Filaments lediglich ein kosmischer Zufall sind und es keinen wirklichen Zusammenhang zwischen Filament und Schwarzem Loch gibt. Damit wäre es lediglich ein Filament wie viele andere in der Milchstraßen-Galaxie. Ein solcher Zufall ist sehr unwahrscheinlich.

Jedes dieser drei Szenarios würde Astronomen neue Erkenntnisse bescheren, sollte es sich als wahr herausstellen. Im Falle der ersten Theorie gäbe dies Astronomen beispielsweise neue Informationen über das magnetische Feld in dieser Umgebung und würde zeigen, dass dies eher gleichmäßig statt chaotisch ist. Sollte es sich um einen kosmischen String handeln, wäre dies die erste Entdeckung eines solchen überhaupt.

Und auch wenn das Objekt nicht mit dem Schwarzen Loch im Zentrum der Galaxie verbunden ist, ist dessen Kurve trotzdem ungewöhnlich. Sie könnte etwa von einer Schockwelle, ähnlich wie bei einem Doppelknall, verursacht worden sein. Dabei kollidiert die Denonationswelle eines explodierenden Sterns mit den gewaltigen Winden, die von massereichen Sternen um das Schwarze Loch im Zentrum der Galaxie verursacht werden.

DAS KÖNNTE EUCH AUCH INTERESSIEREN:

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 Forscher haben eine überraschende Entdeckung auf dem interstellaren Objekt gemacht, das derzeit durch unser Sonnensystem fliegt

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          Implausible Deniability: 2002 Ford Thunderbird Neiman Marcus Edition       Cache   Translate Page      
If the universe is indeed as infinitely large as the astrophysicists and heliocentric heretics would have us believe, then Dean Koontz was on to something when he wrote: “In an infinite universe, anything that could be imagined might somewhere exist.” Imagine for a minute that in 2002 when Ford brought out its retro-styled 78th generation Thunderbird that they built a Neiman Marcus limited edition to celebrate third world sweatshops and corporate acquisitions and mergers...or something.  Anyway, find this 2002 Ford Thunderbird Neiman Marcus Edition offered for $18,000 in Sherman Oaks, CA via craigslist. Tip from...I dunno where I found this thing...but I think somebody sent it in...



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          Neil deGrasse Tyson on what space militarization means      Cache   Translate Page      
Author and astrophysicist Neil deGrasse Tyson discusses his new book 'Accessory to War: The Unspoken Alliance Between Astrophysics and the Military.'
          #7: Accessory to War: The Unspoken Alliance Between Astrophysics and the Military      Cache   Translate Page      
Accessory to War
Accessory to War: The Unspoken Alliance Between Astrophysics and the Military
Neil deGrasse Tyson , Avis Lang
3.5 out of 5 stars(3)
Release Date: September 11, 2018

Buy new: $30.00 $17.99
102 used & new from $14.75

(Visit the Hot New Releases in Books list for authoritative information on this product's current rank.)
          The long entanglement of war and astrophysics.      Cache   Translate Page      
Related Articles

The long entanglement of war and astrophysics.

Nature. 2018 Sep;561(7722):173-174

Authors: Weinberger S

PMID: 30206399 [PubMed - in process]


          Trans Neptunian Objects And Comets Saas Fee Advanced Course 35 Swiss Society For Astrophysics And A       Cache   Translate Page      
Dcument Of Trans Neptunian Objects And Comets Saas Fee Advanced Course 35 Swiss Society For Astrophysics And A
          Die Sonne wird die Erde zerstören — und zwar viel früher, als ihr denkt      Cache   Translate Page      

14294653894_cd7dd43b30_o (1)

Es gibt viele Möglichkeiten, wie es mit der Erde zu Ende gehen könnte. Beispielsweise könnten wir in einen anderen Planeten krachen, von einem schwarzen Loch geschluckt oder von Asteroiden erschlagen werden. Allerdings können wir nicht sagen, wann oder ob eines dieser Szenarien auch tatsächlich eintreffen wird.

Eine Sache ist jedoch sicher: Selbst wenn die Erde gefährlichen Aliens, tödlichen Riesenkometen und der nuklearen Apokalypse entkommen kann — eines Tages wird unsere eigene Sonne sie zerstören. Und dieser Tag könnte früher kommen, als wir glauben. Das sagte zumindest Jillian Scudder, Astrophysikerin der Universität in Sussex, gegenüber Business Insider.

Die Erde wird ausgetrocknet

Die Sonne überlebt, indem sie Wasserstoffatome in ihrem Kern zu Heliumatomen verbrennt. Genau genommen verbrennt sie sogar 600 Millionen Tonnen Wasserstoff pro Sekunde.

via GIPHY

Und während der Kern mit Helium gesättigt wird, schrumpft er, was die Reaktionszeit der Kernfusionen beschleunigt — das heißt, die Sonne spuckt mehr Energie aus. Pro einer Milliarden Jahre, in denen die Sonne Wasserstoff verbrennt, wird sie um etwa zehn Prozent heller.

via GIPHY

Und obwohl zehn Prozent in einer Milliarde Jahre nicht sehr viel erscheinen mögen, könnte das für unseren Planeten katastrophale Folgen haben.

„Die Vorhersagen darüber, was genau mit der Erde passieren wird, während die Sonne innerhalb der nächsten Milliarde Jahre immer heller wird, sind ungewiss“, sagt Scudder. „Aber der allgemeine Standpunkt ist, dass die zunehmende Hitze der Sonne mehr Wasser von der Erdoberfläche verdampfen lässt und es in der Atmosphäre festhält. Das Wasser verhält sich dann wie ein Treibhausgas, das mehr einfallende Hitze einfängt, was wiederum das Verdampfen beschleunigt.“ 

Bevor der Sonne jemals der Wasserstoff ausgehen wird, wird das energiereiche Sonnenlicht unsere Atmosphäre bombardieren und „die Moleküle aufspalten, wodurch das Wasser als Wasserstoff und Sauerstoff entweichen kann, was schlussendlich die Erde austrocknen wird“, sagt Scudder.

14511395782_0192a4402b_oDas ist aber noch nicht das Ende vom Lied. Eine zehnprozentige Steigerung der Helligkeit pro einer Milliarde Jahre bedeutet, dass in 3,5 Milliarden Jahren die Sonne etwa 40 Prozent heller scheinen wird. Das wird die Ozeane der Erde zum Kochen bringen, die Eiskappen schmelzen lassen und die komplette Feuchtigkeit aus der Erdatmosphäre ziehen.

via GIPHY

Unser Planet, der einst vor Leben nur so spross, wird unerträglich heiß, trocken und karg werden — wie die Venus. 

23667749481_25ebf87a65_oWährend die Zeit allmählich voranschreitet, wird die Zukunft für uns sehr düster aussehen.

Die letzten Atemzüge der Sonne

Alles hat nun einmal ein Ende und eines Tages, in etwa vier oder fünf Milliarden Jahren, wird die Sonne auch das letzte bisschen Wasserstoff verbrannt haben und stattdessen Helium verbrennen. 

„Wenn der Wasserstoff einmal aufgehört hat, im Kern der Sonne zu brennen, verlässt sie offiziell ihren Platz in der Hauptreihe der Sterne und kann als Roter Riese bezeichnet werden“, sagt Scudder. „Dann wird sie etwa eine Milliarde Jahre damit verbringen, Helium im Kern zu verbrennen und zu expandieren. Die Schale um den Kern herum wird immer noch dazu in der Lage sein, Wasserstoff zu Helium zu verschmelzen.“

eso0927a (1)Die Sonne wird ihre äußeren Schichten verlieren, an Masse abnehmen und ihre Anziehungskraft auf die Planeten wird schwächer. Das hat zur Folge, dass alle Planeten aus der Umlaufbahn der Sonne ein wenig weiter weg driften.

Wenn die Sonne zu einem völlig ausgebildeten Roten Riesen wird, wird der Kern so extrem heiß und dicht, dass sich die äußere Schale ausdehnt... sehr weit ausdehnt.

via GIPHY

Ihre Atmosphäre wird sich bis zur gegenwärtigen Umlaufbahn des Mars ausweiten — Merkur und Venus werden einfach geschluckt.

via GIPHY

Obwohl die Atmosphäre der Sonne die Umlaufbahn des Mars erreichen wird, entkommt der Mars, weil er aus der Reichweite der Sonne herausgewandert sein wird.

Für die Erde gibt es zwei Möglichkeiten: Sie könnte entweder der sich ausdehnenden Sonne entkommen oder von ihr verzehrt werden. Aber selbst wenn unser Planet der Sonne entfliehen kann, werden die hohen Temperaturen ihn zu einem trockenen, toten Häufchen Asche verbrennen.

„In jedem Fall wird sich der Planet sehr nah an der Oberfläche des Roten Riesen befinden, keine gute Voraussetzung für Leben“, sagt Scudder.

14108347950_7c8933bfab_o (1)Vom Roten Riesen zum Weißen Zwerg

Sobald die Sonne ihre Reserven verbraucht hat, wird sie instabil und beginnt, zu pulsieren.

via GIPHY

Mit jedem Pulsschlag wird die Sonne Schichten ihrer äußeren Atmosphäre abwerfen, bis alles, was noch übrig bleibt, ein heißer, schwerer Kern, umgeben von planetarischem Nebel sein wird. 

pneMit jedem weiteren Tag wird dieser Kern, der auch Weißer Zwerg genannt wird, abkühlen und langsam verschwinden.

Aber macht euch keine Sorgen. Es gibt jede Menge andere Dinge, die uns wahrscheinlich zuerst umbringen werden.

Das könnte euch auch interessieren:

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 Diese 11 faszinierenden Fotos zeigen, wie winzig unser Planet in den Weiten des Universum ist

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          Astrophysics Eagle Pier with extras!      Cache   Translate Page      
For Sale

Up for sale is my excellent Astro-physics 6" diameter Eagle pier. It's incredibly stable and perfect for a mobile rig. It's also very fast to set up - no more than a minute or so to get it setup. It's been a perfect companion for my Mach 1. Has some scuffs here and there, and velco on the sides of some of the legs for attaching accessories. Other than that, it's in great condition!

There are additional accessories:
1. Eagle carrying case - long enough to carry Eagle and an optional extension together. AP part number C0052 (365 new)
2. Eagle trays. AP part numbers TRAY06 and TRAY06H.

All together, I'm asking for either $1250 for the Eagle pier, or $1500 for the pier and case. For the TRAY06, add $60. For the Tray06H, add $70.

Buyer to pay for shipping and paypal charges, if applicable.

Thanks for looking!

1250.00
          #7: Accessory to War: The Unspoken Alliance Between Astrophysics and the Military      Cache   Translate Page      
Accessory to War: The Unspoken Alliance Between Astrophysics and the Military Neil...

          Accessory to War: The Unspoken Alliance Between Astrophysics and the Military      Cache   Translate Page      
Accessory to War: The Unspoken Alliance Between Astrophysics and the Military
author: Neil deGrasse Tyson
name: Khanada
average rating: 0.0
book published: 2018
rating: 0
read at:
date added: 2018/09/11
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          Ces questionnements, que j'ai traversés comme sur Expérience et interprétation      Cache   Translate Page      
Ces questionnements, que j'ai traversés comme beaucoup d'entre nous je suppose, sont eux-même l'effet de l'ignorance fondamentale (avidya).
Tu n'as (surtout) pas besoin d'être érudit pour trouver des réponses. Dans l'expérience de l'Ultime, ces questions s'évanouissent. Dans le bouddhisme on parle d'"auto-libération". Autrement, et pour une approche "rationnelle" et discursive, il y a l'excellent livre de Trinh Xuan Thuan et Matthieu Ricard "L'Infini dans la paume de la main - Le moine et l'astrophysicien", qui aborde bien des points que tu évoques. :-)
          In New 'Ask a Spaceman' Episode, Black Holes Are Doomed to Die      Cache   Translate Page      
We're back into the weird science of black holes in this week's installment of "Ask a Spaceman." In this episode, astrophysicist and Space.com columnist Paul Sutter explains why a black hole is doomed to die from the moment of its birth.
          Fisch receives Fusion Power Associates’ Distinguished Career Award      Cache   Translate Page      
Nat Fisch, associate director for academic affairs at the U.S. Department of Energy’s Princeton Plasma Physics Laboratory, and professor of astrophysical sciences and director of the Program in Plasma Physics at Princeton University, has received a 2018 Distinguished Career Award from Fusion Power Associates.
          2018 Kavli Prize in Astrophysics: A Conversation with Ewine van Dishoeck      Cache   Translate Page      
Ewine van Dishoeck, the 2018 Kavli Prize laureate, discusses her personal and professional journey into the field of astrochemistry.
          2018 Kavli Prize in Astrophysics: A Conversation with Ewine van Dishoeck      Cache   Translate Page      
Ewine van Dishoeck, the 2018 Kavli Prize laureate, discusses her personal and professional journey into the field of astrochemistry.
          2018 Kavli Prize in Astrophysics: A Conversation with Ewine van Dishoeck      Cache   Translate Page      
Ewine van Dishoeck, the 2018 Kavli Prize laureate, discusses her personal and professional journey into the field of astrochemistry.
          Mysterious repeating radio bursts from distant galaxy could be sign of extraterrestrial technology      Cache   Translate Page      

Researchers from extraterrestrial research initiative Breakthrough Listen, the SETI Institute, and UC Berkeley used machine learning to detect mysterious repeating radio bursts from a galaxy 3 billion light years from Earth. As of now, the source of the fast radio bursts (FRBs) is unknown and, yes, the bursts "could be the signatures of technology developed by extraterrestrial intelligent life," according to the scientists. From the SETI Institute:

In August of 2017, the Listen science team at the University of California, Berkeley SETI Research Center observed FRB 121102 for five hours, using digital instrumentation at the GBT. Combing through 400 TB of data, they reported (in a paper [pdf] led by Berkeley SETI postdoctoral researcher Vishal Gajjar, recently accepted for publication in the Astrophysical Journal) a total of 21 bursts. All were seen within one hour, suggesting that the source alternates between periods of quiescence and frenzied activity.

Now, (UC Berkeley doctoral student Gerry) Zhang and collaborators have developed a new machine learning algorithm, and reanalyzed the 2017 GBT dataset, finding an additional 72 bursts that were not detected originally...

Additional FRB research may provide clues about whether or not they are signatures of extraterrestrial technology.

More at UC Berkeley news: "AI helps track down mysterious cosmic radio bursts"

          2018 Kavli Prize in Astrophysics: A Conversation with Ewine van Dishoeck      Cache   Translate Page      
Ewine van Dishoeck, the 2018 Kavli Prize laureate, discusses her personal and professional journey into the field of astrochemistry.
          In New 'Ask a Spaceman' Episode, Black Holes Are Doomed to Die      Cache   Translate Page      
We're back into the weird science of black holes in this week's installment of "Ask a Spaceman." In this episode, astrophysicist and Space.com columnist Paul Sutter explains why a black hole is doomed to die from the moment of its birth.
          Convolutions on the Sphere: Commutation with Differential Operators. (arXiv:1808.03323v2 [math-ph] UPDATED)      Cache   Translate Page      

Authors: Hussein Aluie

We generalize the definition of convolution of vectors and tensors on the 2-sphere, and prove that it commutes with differential operators. Moreover, vectors and tensors that are normal/tangent to the spherical surface remain so after the convolution. These properties make the new filtering operation particularly useful to analyzing and modeling nonlinear dynamics in spherical systems, such as in geophysics, astrophysics, and in inertial confinement fusion applications. An essential tool we use is the theory of scalar, vector, and tensor spherical harmonics. We then show that our generalized filtering operation is equivalent to the (traditional) convolution of scalar fields of the Helmholtz decomposition of vectors and tensors.


          #9: Accessory to War: The Unspoken Alliance Between Astrophysics and the Military      Cache   Translate Page      
Accessory to War: The Unspoken Alliance Between Astrophysics and the Military Neil...

          Mysterious repeating radio bursts from distant galaxy could be sign of extraterrestrial technology      Cache   Translate Page      

Researchers from extraterrestrial research initiative Breakthrough Listen, the SETI Institute, and UC Berkeley used machine learning to detect mysterious repeating radio bursts from a galaxy 3 billion light years from Earth. As of now, the source of the fast radio bursts (FRBs) is unknown and, yes, the bursts "could be the signatures of technology developed by extraterrestrial intelligent life," according to the scientists. From the SETI Institute:

In August of 2017, the Listen science team at the University of California, Berkeley SETI Research Center observed FRB 121102 for five hours, using digital instrumentation at the GBT. Combing through 400 TB of data, they reported (in a paper [pdf] led by Berkeley SETI postdoctoral researcher Vishal Gajjar, recently accepted for publication in the Astrophysical Journal) a total of 21 bursts. All were seen within one hour, suggesting that the source alternates between periods of quiescence and frenzied activity.

Now, (UC Berkeley doctoral student Gerry) Zhang and collaborators have developed a new machine learning algorithm, and reanalyzed the 2017 GBT dataset, finding an additional 72 bursts that were not detected originally...

Additional FRB research may provide clues about whether or not they are signatures of extraterrestrial technology.

More at UC Berkeley news: "AI helps track down mysterious cosmic radio bursts"

          Έρευνα: Οι «υδάτινοι κόσμοι» θα μπορούσαν να υποστηρίξουν εξωγήινη ζωή      Cache   Translate Page      

Στην επιστημονική έρευνα όσον αφορά στο θέμα της ύπαρξης εξωγήινης ζωής, η επικρατούσα άποψη είναι πως, για να συμβεί κάτι τέτοιο, μάλλον θα απαιτούνται πλανήτες- «κλώνοι» της Γης. Ωστόσο, επιστήμονες του Πανεπιστημίου του Σικάγο και του Penn State (Pennsylvania State University) αμφισβητούν αυτή την προσέγγιση.

Γενικότερα μιλώντας, η επιστημονική κοινότητα κατά κανόνα θεωρούσε ότι πλανήτες που καλύπτονται από ωκεανούς δεν θα μπορούσαν να υποστηρίξουν τον «κύκλο» ορυκτών και αερίων που διατηρεί το κλίμα σταθερό στη Γη, και ως εκ τούτου δεν θα ήταν «φιλικοί» προς τη ζωή. Ωστόσο, σύμφωνα με τη συγκεκριμένη έρευνα, η οποία δημοσιεύτηκε στις 31 Αυγούστου στο The Astrophysical Journal, πλανήτες- «υδάτινοι κόσμοι» θα μπορούσαν να παραμένουν εντός της θεωρούμενης ως «σωστής» ζώνης για την εμφάνιση ζωής για πολύ μεγαλύτερο χρονικό διάστημα από ό,τι πιστευόταν προηγουμένως. Το συμπέρασμα αυτό προέκυψε από πάνω από 1.000 προσομοιώσεις.

«Αυτό πραγματικά αντιστέκεται στην ιδέα ότι χρειάζεσαι έναν κλώνο της Γης- δηλαδή έναν πλανήτη με στεριά και έναν ρηχό ωκεανό» είπε ο Έντουϊν Κάιτ, επίκουρος καθηγητής γεωφυσικών επιστημών στο Uchicago και επικεφαλής συντάκτης της έρευνας.

Καθώς τα τηλεσκόπια βελτιώνονται, οι επιστήμονες ανακαλύπτουν όλο και περισσότερους πλανήτες σε τροχιά γύρω από από άστρα (εξωπλανήτες). Τέτοιου είδους ανακαλύψεις οδηγούν σε νέες έρευνες πάνω στο πώς η ζωή θα μπορούσε να επιβιώνει σε άλλους πλανήτες, κάποιοι εκ των οποίων είναι πολύ διαφορετικοί από τη Γη- και κάποιοι μπορεί να καλύπτονται από όγκους νερού, βάθους εκατοντάδων χιλιομέτρων.

Δεδομένου του ότι η ζωή χρειάζεται μεγάλο χρονικό διάστημα για να εξελιχθεί, και επειδή το φως και η θερμότητα σε πλανήτες μπορεί να αλλάζουν καθώς τα άστρα γηράσκουν, οι επιστήμονες συνήθως αναζητούν πλανήτες που έχουν τόσο νερό όσο και και τρόπους να κρατούν τα κλίματά τους σταθερά με το πέρασμα του χρόνου. Η κύρια μέθοδος που γνωρίζουμε είναι αυτή που «χρησιμοποιεί» η Γη. Σε βάθος χρόνου, ο πλανήτης μας ψυχραίνεται «τραβώντας» αέρια θερμοκηπίου σε ορυκτά και θερμαίνεται απελευθερώνοντάς τα μέσω ηφαιστείων.

Ωστόσο, το μοντέλο αυτό δεν μπορεί να λειτουργεί σε ένα ωκεάνιο πλανήτη, και οι ερευνητές ασχολήθηκαν με το ερώτημα εάν υπάρχει άλλος τρόπος. Για αυτό, έστησαν μια προσομοίωση με χιλιάδες πλανήτες (οι οποίοι δημιουργούνταν τυχαία) και παρακολούθησαν την εξέλιξη των κλιμάτων τους μέσα σε διάστημα δισεκατομμυρίων ετών. Η έκπληξη για τους επιστήμονες ήταν πως πολλοί από αυτούς παρέμεναν σταθεροί για πάνω από ένα δισεκατομμύριο χρόνια- απλά και μόνο από τύχη. Σύμφωνα με τις εκτιμήσεις τους, επρόκειτο για ποσοστό περίπου 10%.

Οι πλανήτες αυτοί βρίσκονται στις σωστές θέσεις γύρω από τα άστρα τους, και τυχαίνει να έχουν τις σωστές ποσότητες άνθρακα. Επίσης, στους ωκεανούς δεν έχουν διαλυθεί ποσότητες ορυκτών και στοιχείων από τον φλοιό που θα τραβούσαν το διοξείδιο του άνθρακα από την ατμόσφαιρα. Έχουν αρκετό νερό εξαρχής, και ο κύκλος του άνθρακα πραγματοποιείται μόνο μεταξύ της ατμόσφαιρας και του ωκεανού, που, στις σωστές συγκεντρώσεις, επαρκούν για να κρατήσουν τα πράγματα σταθερά.

Στις προσομοιώσεις χρησιμοποιήθηκαν άστρα σαν τον Ήλιο, αλλά η έρευνα απέδωσε αποτελέσματα και για τους «κόκκινους νάνους»: Πλανήτες σε συστήματα με τέτοια άστρα θεωρούνται καλοί υποψήφιοι για παρουσία ζωής, επειδή αυτά τα άστρα γίνονται φωτεινότερα πολύ πιο αργά από τον Ήλιο- δίνοντας στη ζωή μεγαλύτερο χρονικό περιθώριο για να ξεκινήσει. Οι ίδιες συνθήκες που παρουσιάστηκαν στο σχετικό paper θα μπορούσαν να ισχύουν και για πλανήτες γύρω από «κόκκινους νάνους»: Θεωρητικά, το μόνο που χρειάζεται είναι το σταθερό φως ενός άστρου.


          2018 Kavli Prize in Astrophysics: A Conversation with Ewine van Dishoeck      Cache   Translate Page      
Ewine van Dishoeck, the 2018 Kavli Prize laureate, discusses her personal and professional journey into the field of astrochemistry.


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