Andromeda Galaxy

Andromeda galaxy is approximately 2.5 million light years away from earth and is the nearest spiral galaxy to the milky way but not the closest over all. This certain galaxy is named after the mythical princess Andromeda. Andromeda is the largest galaxy is the largest of the group which consists of the milky way and the Triangulum galaxy and about 30 other smaller Galaxies. It is one of the only 4 galaxies that can be seen without a telescope. They thought the width of this galaxies disk is about 260,000 light years . But they discovered low-metallicity, red giant stars about 500,000 ly away from Andromeda's core which means that the galaxy is much larger than they thought so that Andromeda's halo might actually overlap the milky way's. Andromeda's disk might be as much as twice as large than the milky way's. recent studies say that Andromeda is about 200 billion solar masses and the milky way is as much as 600 billion solar masses.