Andromeda and Milky Way Galaxies Are Already Touching

Andromeda Collides Milky Way

The merger of the Milky Way and Andromeda galaxy won’t happen for another 4 billion years, but the recent discovery of a massive halo of hot gas around Andromeda may mean our galaxies are already touching. The Andromeda Galaxy is the largest member of a ragtag collection of some 54 galaxies, including the Milky