Light year

Hot stars burn brightly in this new image from NASA's Galaxy Evolution Explorer, showing the ultraviolet side of a familiar face. At approximately 2.5 million light-years away, the Andromeda galaxy, or M31, is our Milky Way's largest galactic neighbor. The entire galaxy spans 260,000 light-years across.

The Largest Structure in The Universe 🏆 It’s named BOSS. What do you think it looks like?? 🤔 The Boss Great Wall is a supercluster of galaxies that span over a billion light years across. This makes it the largest structure we’ve ever observed. It’s named after the Baryon Oscillation Spectroscopic Survey - an international effort to map galaxies and quasars. The wall is made up of 830 separate galaxies that gravity turned into four superclusters; connected by massive filaments of hot gas…

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This amazing photo is from the very talented @leo_houlding taken in Antarctica. It’s a very rare and beautiful solar parhelion which is in…

Just 12 million light-years away, the galaxies Messier 81 and 82 offer a nearby preview of the Milky Way-Andromeda merger.

Sensitive test to detect a possible fifth fundamental force known as the chameleon force provides the best evidence yet that it isn’t a valid candidate for dark energy

If the universe is expaning evenly, how is it possible for galaxies to ever collide? Shouldn't they become more and more distant from each other as the universe expands?