Cool astronomy photos

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Witness
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Re: Cool astronomy photos

Post by Witness » Sat Dec 28, 2019 12:05 am



Best watched fullscreen.

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Witness
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Re: Cool astronomy photos

Post by Witness » Sun Dec 29, 2019 12:00 am

Image
This long-exposure Hubble Space Telescope image of massive galaxy cluster Abell 2744 (foreground) is the deepest ever made of any cluster of galaxies. It shows some of the faintest and youngest galaxies ever detected in space.

The immense gravity in Abell 2744 is being used as a lens to warp space and brighten and magnify images of more distant background galaxies. The more distant galaxies appear as they did longer than 12 billion years ago, not long after the big bang.

The Hubble exposure reveals almost 3,000 of these background galaxies interleaved with images of hundreds of foreground galaxies in the cluster. Their images not only appear brighter, but also smeared, stretched and duplicated across the field. Because of the gravitational lensing phenomenon, the background galaxies are magnified to appear as much as 10 to 20 times larger than they would normally appear. Furthermore, the faintest of these highly magnified objects is 10 to 20 times fainter than any galaxy observed previously. Without the boost from gravitational lensing, the many background galaxies would be invisible.

The Hubble exposure will be combined with images from Spitzer and NASA's Chandra X-ray Observatory to provide new insight into the origin and evolution of galaxies and their accompanying black holes.
https://www.nasa.gov/content/hubble-fro ... abell-2744

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Re: Cool astronomy photos

Post by Witness » Tue Dec 31, 2019 3:17 am

Image
This is a real image (15 vertical shots) of the Uyuni salt flat. The Salar de Uyuni is so extraordinarily flat that after it rains it becomes the worlds largest mirror spanning over 130km. [ Image Credit & Copyright: Jheison Huerta ]
https://jheisonhuerta.com/sobre-jheison-huerta

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Re: Cool astronomy photos

Post by Witness » Tue Dec 31, 2019 11:34 pm

Image

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Re: Cool astronomy photos

Post by Witness » Sat Jan 04, 2020 2:56 am

Moon & Venus as seen from Earth (composite image):

Image

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Re: Cool astronomy photos

Post by Witness » Sat Jan 18, 2020 2:14 am

Cool simulation of a giant star:
3D models of AGB stars

Emergent surface intensity

The intensity movies show the star approximately as it might appear to the human eye (In detail: The emergent bolometric surface intensity is color coded with the standard "red-heat" table, to get a color representation adequate for a AGB star.). The "boiling" surface of the star shows irregular hot (white or yellow) and "cool" (red or dark-red) areas. They change their intensity and shape on time-scales of months.

https://www.astro.uu.se/%7Ebf/movie/intensity.html


And a supernova: