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

Triangulum Galaxy A galaxy that’s losing its identity Sunday, November 10, 2013
Andromeda Galaxy III Building a galactic giant Saturday, November 9, 2013
Andromeda Galaxy II Black holes in a neighboring galaxy Friday, November 8, 2013
Andromeda Galaxy A journey into the distant past Thursday, November 7, 2013
Bright Black Hole Brightness from the ultimate darkness Wednesday, January 30, 2013
M31’s Central Cluster Bright stars around a galaxy’s dark heart Tuesday, January 29, 2013
Collision Course Taking aim at another galaxy Wednesday, September 12, 2012
Andromeda Galaxy A galactic twin in the evening sky Tuesday, September 11, 2012
Andromeda Galaxy Looking deep into the universe Tuesday, October 25, 2011
Galactic Leaders The leaders of a galactic pack Friday, November 5, 2010
Supernova 1885 Lighting up the enormous universe Friday, August 20, 2010
Black Hole Flare-Up A black hole gets brighter Tuesday, August 3, 2010
Andromeda Galaxy Gazing into the far-distant past Friday, October 16, 2009

Featured Images

Close-up of the core of M31
M31 Blues Tuesday, January 29, 2013
Andromeda and the Milky Way head for a galactic pile-up
Collision Course Wednesday, September 12, 2012
Starry Neighbor Friday, February 26, 2010
Hot Galaxy Friday, September 18, 2009
Galactic Empire Tuesday, September 19, 2006

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