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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

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

Deep Vision Looking deep into the universe December 19, 2014

Triangulum Galaxy A galaxy that’s losing its identity November 9, 2013

Andromeda Galaxy III Building a galactic giant November 8, 2013

Andromeda Galaxy II Black holes in a neighboring galaxy November 7, 2013

Andromeda Galaxy A journey into the distant past November 6, 2013

Bright Black Hole Brightness from the ultimate darkness January 29, 2013

M31’s Central Cluster Bright stars around a galaxy’s dark heart January 28, 2013

Collision Course Taking aim at another galaxy September 11, 2012

Andromeda Galaxy A galactic twin in the evening sky September 10, 2012

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