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Andromeda Galaxy, M31

The closest large galaxy to our own, at a distance of about 2.5 million light-years. It is a spiral galaxy that appears to be slightly larger but less massive than the Milky Way.

Radio Programs

Equal Galaxies? Balancing two big galaxies September 18, 2018

Future Blast A future blast from a galactic neighbor October 27, 2017

Local Group IV A collision course for the Milky Way January 12, 2017

Big Neighbor A bright galaxy far, far away October 23, 2016

Runaway Giant A giant star that’s running away from home October 19, 2016

More Andromeda Galaxy Getting ready to put on a show September 16, 2015

Andromeda Galaxy Taking in all of a giant galaxy September 15, 2015

Featured Images

sequence of images depicting the merger of M31 and Milky Way galaxies

Crash Course January 11, 2017
The Andromeda galaxy, M31

Old News December 20, 2014
Close-up of the core of M31

M31 Blues January 29, 2013
Andromeda and the Milky Way head for a galactic pile-up

Collision Course September 12, 2012

Starry Neighbor February 26, 2010