On the left is a galaxy called M81. It is surrounded by blue spiral arms as it rests across from the red gas and dust clouds of M82. The galaxies are in a gravitational combat, and they have been for billions of years. In the next few billion years, only one of the two galaxies will have survived. Scientists suspect that the gravity waves sent off by M82 caused the richness of the blue spiral arms on M81. Both galaxies are huge. M81 is located in Ursa Major, and is one of the brightest galaxies as seen from Earth. M82 is an irregular galaxy, sometimes known as the cigar galaxy.
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