The Milky Way galaxy is in a galaxy cluster called the Local Group. This cluster has around 50 members the largest of which are the Andromeda, Milky Way and Triangulum galaxies.
Astronomy Fact of the Day: November 17, 2018

The Milky Way galaxy is in a galaxy cluster called the Local Group. This cluster has around 50 members the largest of which are the Andromeda, Milky Way and Triangulum galaxies.