Messier 81 and 82 two galaxies in the constellation Ursa Major. These galaxies are relatively close at 12 million light years away and the big one, M81 or Bode’s Galaxy, is 90,000 light years in diameter. It also has a massive black hole at its core with a mass 70 million that of the sun. M82 (also known as the Cigar Galaxy), a starburst galaxy, is undergoing very high star formation due to interaction with M81. It measures 37,000 light years in diameter and its center is 100 times brighter than

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