"A supercomputer simulation shows many galaxies merging over time. The parts of galaxies we can see are glowing stars forming ...

A blob of gas seen outside the Milky Way could be a type of starless, dark matter–dominated galaxy. Some scientists are skeptical.

The findings reveal unusual chemical signatures and offer new insights into the behavior of novas beyond the Milky Way.

The embedded variable stars proved that the Andromeda nebula was much farther away than the stars that comprised the Milky Way. Andromeda was therefore a separate galaxy — similar to ...

For the best chance of watching the spectacular northern lights, many head to areas around the Arctic, such as Norway, ...

If Andromeda’s past merger is any indication, the Milky Way’s structure could be completely reshaped when the two galaxies collide.

Two galaxies that closely neighbour the Milky Way are at war, with the larger tearing the smaller galaxy to shreds. The Magellanic Clouds are two dwarf galaxies, visible from the Southern Hemisphere, ...

In a first-ever near-infrared study of a recurrent nova beyond the Milky Way, astronomers have discovered ... the energy is provided by fast electrons that collide with the atom/ion, imparting ...

But when galaxies are relatively close—such as the Milky Way and Andromeda—we expect that their mutual gravitational attraction will draw them to collide. Both, you could say. Petroglyphs ...

Looking for a really big story, I naturally headed for "Galaxies in Collision." Bradley Whitmore of the Space Telescope Science Institute in Baltimore brought us up to speed. We've known for a ...