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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.

Featured Images

Spitzer infrared view of M31

Hot Spiral August 13, 2021

Busy Neighbor October 26, 2019

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

Crash Course January 11, 2017

Radio Programs

Spiral Arms Bright arms for beautiful galaxies August 13, 2021

Andromeda III Building a galactic giant November 6, 2020

Galactic Twin A galactic twin in the evening sky October 27, 2019

Andromeda Galaxy A journey into the distant past October 26, 2019

Galactic Collision Heading for a galactic pile-up August 21, 2019

Light Connection Making long-distance connections February 7, 2019

Andromeda Galaxies The orderly Andromeda galaxies October 12, 2018

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