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A 2017 U1: An Interstellar Visitor : Traveling at high velocity…

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A 2017 U1: An Interstellar Visitor : Traveling at high velocity…

A 2017 U1: An Interstellar Visitor : Traveling at high velocity along an extreme hyperbolic orbit and making a hairpin turn as it swung past the Sun, the now designated A/2017 U1 is the first known small body from interstellar space. A point of light centered in this 5 minute exposure recorded with the William Herschel Telescope in the Canary Islands on October 28, the interstellar visitor is asteroid-like with no signs of cometary activity. Faint background stars appear streaked because the massive 4.2 meter diameter telescope is tracking the rapidly moving A/2017 U1 in the field of view. Astronomer Rob Weryk (IfA) first recognized the moving object in nightly Pan-STARRS sky survey data on October 19. A/2017 is presently outbound, never to return to the Solar System, and already only visible from planet Earth in large optical telescopes. Though an interstellar origin has been established based on its orbit, it is still unknown how long the object could have drifted among the stars of the Milky Way. But its interstellar cruise speed would be about 26 kilometers per second. By comparison humanity’s Voyager 1 spacecraft travels about 17 kilometers per second through interstellar space. via NASA

Source: Just Space


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Revealing What Lies Beneath : This false-color image…

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Revealing What Lies Beneath : This false-color image…

Revealing What Lies Beneath : This false-color image demonstrates how use of special filters available on the Curiosity Mars rover’s Mast Camera (Mastcam) can reveal the presence of certain minerals in target rocks. T (via NASA)

Source: Just Space


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NGC 891 vs Abell 347 : Distant galaxies lie beyond a foreground…

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NGC 891 vs Abell 347 : Distant galaxies lie beyond a foreground…

NGC 891 vs Abell 347 : Distant galaxies lie beyond a foreground of spiky Milky Way stars in this telescopic field of view. Centered on yellowish star HD 14771, the scene spans about 1 degree on the sky toward the northern constellation Andromeda. At top right is large spiral galaxy NGC 891, 100 thousand light-years across and seen almost exactly edge-on. About 30 million light-years distant, NGC 891 looks a lot like our own Milky Way with a flattened, thin, galactic disk. Its disk and central bulge are cut along the middle by dark, obscuring dust clouds. Scattered toward the lower left are members of galaxy cluster Abell 347. Nearly 240 million light-years away, Abell 347 shows off its own large galaxies in the sharp image. They are similar to NGC 891 in physical size but located almost 8 times farther away, so Abell 347 galaxies have roughly one eighth the apparent size of NGC 891. via NASA

Source: Just Space


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