Data for Using Hubble Law Approach
Hubble's Constant and Distance to M31
Looking up "distance to M31" on the web, it is easy to find that the Andromeda galaxy (the other name for M31) is 2,900,000 light years away. Wow! That seems like a long way, but actually the Andromeda galaxy is one of our nearby neighbors! The value of Hubble's constant, H0, was vigorously sought in the 20th century. It was determined in the early 21st century independently by the Hubble Space Telescope and the Wilkenson Microwave Anisotropy Probe to be 72 km/sec/Mpc.
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