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

In the years following the launch of NASA's Hubble Space Telescope, astronomers have tallied over 1 trillion galaxies in the universe. But only one galaxy stands out as the most important nearby ...

Edwin Hubble authored a paper in 1926 that outlined the classification of some four hundred galaxies by their appearance—as either spiral, barred spiral, lenticular, elliptical, or irregular.

In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...

The full image includes some 2.5 billion pixels compiled from observations spanning more than 1,000 orbits around Earth ...

"It looks like it has been through some kind of event that caused it to form a lot of stars and then just shut down” ...

Curtis argued that the spiral nebulas were galaxies in their own right, but said that the Milky Way was only 10,000 light ...

Panorama of Nearest Galaxy Unveils Hundreds of Millions of Stars On a crisp, clear autumn night, you can see the most distant object visible to the naked eye — the stunning Andromeda Galaxy, our Milky ...

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