Figure 23-3: R I V U X G
The Andromeda Galaxy Also known as M31, the Andromeda Galaxy can be seen with a small telescope, or even the naked eye on a clear night. Edwin Hubble was the first to demonstrate that M31 is actually a galaxy that lies far beyond the Milky Way. M31 is the largest galactic neighbor near our Milky Way. A collision between our Milky Way and the Andromeda Galaxy is expected in about 3.75 billion years. M32 and M110 are two small satellite galaxies that orbit M31.
(Science Source)