Astronomija - opšta tema

[Bujodrag]

 

 

 

https://www.nasa.gov/feature/goddard/from-a-million-miles-away-nasa-camera-shows-moon-crossing-face-of-earth

 

[bigvlada]

New Horizons Returns First of the Best Images of Pluto

 

 

The Mountainous Shoreline of Sputnik Planum: In this highest-resolution image from NASA’s New Horizons spacecraft, great blocks of Pluto’s water-ice crust appear jammed together in the informally named al-Idrisi mountains. "The mountains bordering Sputnik Planum are absolutely stunning at this resolution," said New Horizons science team member John Spencer of the Southwest Research Institute. "The new details revealed here, particularly the crumpled ridges in the rubbly material surrounding several of the mountains, reinforce our earlier impression that the mountains are huge ice blocks that have been jostled and tumbled and somehow transported to their present locations."

Credits: NASA/JHUAPL/SwRI

 

In this highest-resolution image from NASA’s New Horizons spacecraft, great blocks of Pluto’s water-ice crust appear jammed together in the informally named al-Idrisi mountains. Some mountain sides appear coated in dark material, while other sides are bright. Several sheer faces appear to show crustal layering, perhaps related to the layers seen in some of Pluto’s crater walls. Other materials appear crushed between the mountains, as if these great blocks of water ice, some standing as much as 1.5 miles high, were jostled back and forth. The mountains end abruptly at the shoreline of the informally named Sputnik Planum, where the soft, nitrogen-rich ices of the plain form a nearly level surface, broken only by the fine trace work of striking, cellular boundaries and the textured surface of the plain’s ices (which is possibly related to sunlight-driven ice sublimation). This view is about 50 miles wide. The top of the image is to Pluto’s northwest.

Credit: NASA/JHUAPL/SwRI

 

https://www.nasa.gov/feature/new-horizons-returns-first-of-the-best-images-of-pluto

Edited December 7, 2015 by bigvlada

[Skyhighatrist]

http://www.youtube.com/watch?v=4DJmvfpPEX8

What LISA Pathfinder is doing and how

[Gospodin Slucaj]

yet another cool video https://www.facebook.com/futurism.co/videos/468599569985914/

The European Extremely Large Telescope

[Gospodin Slucaj]

kao nasli jos jednu planetu koja orbitira oko nase zvezde? na 300 AU

super earth

http://futurism.com/links/19417/

[Skyhighatrist]

 

One possibility (and the one I think most likely) is that it’s an extreme trans-Neptunian object about 100 astronomical units away from the Sun, which is further than Sedna at 86 AU. This would make it the most distant known object in the solar system, but likely smaller than Pluto.

 

Al' kad jbn twitter ishajpuje, iz mesta se pretvori u "Amazing find - Earth's big brother!"

Clickbait.

[gone fishing]

nemesis ^_^

tražili su prošle godine braon patuljka koji je u binarnoj vezi sa suncem ali ga nisu našli a time ni rešili misteriju neidentifikovane mase koju ne mogu da detektuju a koja fali u našem sistemu

[Gospodin Slucaj]

kao nasli jos jednu planetu koja orbitira oko nase zvezde? na 300 AU

super earth

http://futurism.com/links/19417/

 

[Bujodrag]

Kratko al' efektno

 

[bigvlada]

Visible light from black holes detected for first time

Scientists observing V404 Cygni discovered that even amateur telescopes are capable of capturing violent outburst from black holes closest to Earth

 

 A Nasa illustration of a supermassive black hole. Before the V404 Cygni observations, similar outbursts had only been seen as intense flashes of x-rays and gamma-rays, using high-spec telescopes.
Photograph: Nasa/Reuters

 

Astronomers have discovered that black holes can be observed through a simple optical telescope when material from surrounding space falls into them and releases violent bursts of light.

The apparent contradiction emerges when a black hole’s gravity pulls in matter from nearby stars, producing light that can be viewed from a modest 20cm telescope.

Japanese researchers detected light waves from V404 Cygni - an active black hole in the constellation of Cygnus, the Swan - when it awoke from a 26-year-long slumber in June 2015.

Stephen Hawking: 'If you feel you are in a black hole, don’t give up. There’s a way out.'

 

Read more

Writing in the journal Nature, Mariko Kimura of Kyoto University and others report how telescopes spotted flashes of light coming from the black hole over the two weeks it remained active. The flashes of light lasted from several minutes to a few hours. Some of the telescopes were within reach of amateur astronomers, with lenses as small as 20cm.

“We now know that we can make observations based on optical rays - visible light, in other words - and that black holes can be observed without high-spec x-ray or gamma-ray telescopes,” Kimura said.

The black hole, one of the closest to Earth, has a partner star somewhat smaller than the sun. The two objects circle each other every six-and-a-half days about 8,000 light years from Earth.

Black holes with nearby stars can burst into life every few decades. In the case of V404 Cygni, the gravitational pull exerted on its partner star was so strong that it stripped matter from the surface. This ultimately spiralled down into the black hole, releasing a burst of radiation. Until now, similar outbursts had only been observed as intense flashes of x-rays and gamma-rays.

At 18.31 GMT on 15 June 2015, a gamma ray detector on Nasa’s Swift space telescope picked up the first signs of an outburst from V404 Cygni. In the wake of the event, Japanese scientists launched a worldwide effort to turn optical telescopes towards the black hole.

The flickers of light are produced when x-rays released from matter falling into the black hole heat up the material left behind.

Poshak Gandhi, an astronomer at Southampton University, said the black hole looked extremely bright when matter fell in, despite being veiled by interstellar gas and dust. “In the absence of this veil, V404 Cygni would have been one of the most distant objects in the Milky Way visible in dark skies to the unaided eye in June 2015,” he writes in the journal.

The discovery comes a day after astronomers reported two massive blasts of gas coming from a supermassive black hole in the heart of a galaxy 26 million light years away. Scientists believe that two arcs of x-rays spotted by Nasa’s Chandra X-ray Observatory at the heart of the spiral galaxy, NGC 5195, are the remnants of huge outbursts of gas from the black hole.

“Astronomers often refer to black holes as eating stars and gas. Apparently, black holes can also burp after their meal,” said Eric Schlegel who led the study at the University of Texas in San Antonio. “It is common for big black holes to expel gas outward, but rare to have such a close, resolved view of these events.”

Christine Jones, a co-author at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts, said: “We think these arcs represent fossils from two enormous blasts when the black hole expelled material outward into the galaxy. This activity is likely to have had a big effect on the galactic landscape.” 

The eruptions of gas are thought to have been triggered by the smaller galaxy, NGC 5195, merging with its larger neighbour, the Whirlpool galaxy. The merging process drove gas towards the black hole and the material released energy as it fell inside. As the hot, x-ray-emitting gas poured outwards, it swept up colder hydrogen from the galaxy’s centre like a snowplough.

The work was presented at the annual meeting of the American AstronomySociety in Florida.

http://www.theguardian.com/science/2016/jan/06/visible-light-black-holes-detected-for-first-time-v404-cygni

 

 

 

 

 

 

[Њујоркер]

Jos malo o KIC 8462852. Profesor astronomije i astrofizike s Univerziteta u Luzijani ne bi lenj, pa se dovatio Harvardskih foto ploca, izmerio sjaj doticne zvezde u periodu 1890-1989, i utvrdio da je ista umanjila sjaj za citave 0.2m!

 

Iz rada:

 

 

The star KIC8462852 (TYC 3162-665-1) is apparently a perfectly normal star, with no spectral peculiarities, appearing in the original Cygnus/Lyra field studied with the Kepler spacecraft.  Boyajian et al. (2015) report a complete study of the properties of the star. KIC8462852 is a V=11.705 star (B-V=0.557) at 454 parsec distance. The surface temperature is 6750 K for spectral type of F3 V with no emission lines or anything unusual. Critically, the star does not does not have any infrared excess, with this being confirmed by Lisse et al. (2015), Marengo et al. (2015), and Thompson et al. (2015). With the exception of the DASCH light curve (see below), all data for KIC8462852 are from after the launch of Kepler in 2009. The Kepler light curve displays a series of dips, where the star faded by 0.2%–20% with durations from a day to weeks. I have created two independent Johnson B light curves for KIC8462852 from 1890 to 1989 from the same set of Harvard plates, the first with 1232 plates with DASCH magnitudes, and the second with 131 plates with my by-eye measures. The long-term trend in the DASCH light curve can be described in various ways. One way is simply to note that KIC8462852 faded from B=12.265±0.028 in 1892.5 to B=12.458±0.012 in 1987.5, for a total fading of 0.193±0.030 mag in 95 years. This fade rate is +0.203±0.032 magnitudes per century The KIC8462852 light curve from 1890 to 1989 shows a highly significant secular trend in fading over 100 years, with this being completely unprecedented for any F-type main sequence star. Such stars should be very stable in brightness, with evolution making for changes only on time scales of many millions of years. So the Harvard data alone prove that KIC8462852 has unique and large-amplitude photometric variations. Previously, the only evidence that KIC8462852 was unusual in any way was a few dips in magnitude as observed by one satellite, so inevitably we have to wonder whether the whole story is just some problem with Kepler. Boyajian et al. (2015) had already made a convincing case that the dips were not caused by any data or analysis artifacts, and their case is strong. Nevertheless, it is comforting to know from two independent sources that KIC8462852 is displaying unique and inexplicable photometric variations. 

 

Ceo rad je ovde i moze se bez mnogo nekih velikih poteskosca citati i biti razumljiv i laicima.

 

[Malvo]

Nadlezni sa teme bi mogli da elaboriraju, samo prenosim

 

 

[Prospero]

EVIDENCE FOR A DISTANT GIANT PLANET IN THE SOLAR SYSTEM

 

Konstantin Batygin and Michael E. Brown

Published 2016 January 20 • © 2016. The American Astronomical Society. All rights reserved. 

• The Astronomical Journal, Volume 151, Number 2

 Article PDF

 

 

Article information

 

 

Abstract

 

Recent analyses have shown that distant orbits within the scattered disk population of the Kuiper Belt exhibit an unexpected clustering in their respective arguments of perihelion. While several hypotheses have been put forward to explain this alignment, to date, a theoretical model that can successfully account for the observations remains elusive. In this work we show that the orbits of distant Kuiper Belt objects (KBOs) cluster not only in argument of perihelion, but also in physical space. We demonstrate that the perihelion positions and orbital planes of the objects are tightly confined and that such a clustering has only a probability of 0.007% to be due to chance, thus requiring a dynamical origin. We find that the observed orbital alignment can be maintained by a distant eccentric planet with mass 10 m⊕[/size] whose orbit lies in approximately the same plane as those of the distant KBOs, but whose perihelion is 180° away from the perihelia of the minor bodies. In addition to accounting for the observed orbital alignment, the existence of such a planet naturally explains the presence of high-perihelion Sedna-like objects, as well as the known collection of high semimajor axis objects with inclinations between 60° and 150° whose origin was previously unclear. Continued analysis of both distant and highly inclined outer solar system objects provides the opportunity for testing our hypothesis as well as further constraining the orbital elements and mass of the distant planet.

 

[Њујоркер]

Zanimljivo. Ubica Plutona premetnut u vaskrslog Leverijea.

Jos i da nadjemo drugog Galea taj Neptun II...

[bigvlada]

 

Ovo više ne važi, Makemake ima jedan satelit.  :)