Andromeda is also a flattened spiral like the Milky Way, but it's twice as large — 220,000 light-years across versus 105,000 for the Milky Way — and crammed with a trillion suns. Can you even begin to ...

This illustration shows the location of the 43 quasars scientists used to probe Andromeda’s gaseous halo. Quasars are extremely distant, brilliant cores of galaxies powered by star-eating black holes.

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. This illustration shows a stage in the predicted merger ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. M31, the Andromeda Galaxy, is one of the most spectacular ...

The Milky Way's closest neighbor shines in a spectacular new astrophotography portrait. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Breaking ...

In the next several billion years, our Milky Way Galaxy will merge with the neighboring Andromeda Galaxy, which is now some 2.5 million light-years away. Currently, Andromeda’s disk of stars is a few ...

André van der Hoeven took this image of the Andromeda Galaxy in September 2014. A huge number of stars shine brightly in an amazing skywatcher photo of the Andromeda Galaxy. André van der Hoeven, a ...

Located 2.5 million light years from the Milky Way, the Andromeda Galaxy is the largest galaxy in the Local Group. Also categorized as M31, Andromeda is a spiral galaxy roughly 220,000 light years in ...