Hubble Space Telescope mapped Andromeda, revealing a chaotic history shaped by mergers. A 2.5-billion-pixel mosaic shows 200 ...

For humans, the most important star in the universe is our sun. The second-most important star is nestled inside the ...

Circa 1945: Astronomer Dr. Edwin Powell Hubble sitting in a chair at a desk reading a journal. A staff member at Mt. Wilson ...

A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the ...