Andromeda is our BFF galaxy. At 2.5 million light years away, you’d need to line up 12 Milky Ways in a row to stretch from us to Andromeda. If Andromeda were a bit brighter, it would look huge in our night sky, about 5 times bigger than the moon looks. The Universe is expanding, meaning almost all galaxies are moving farther away from all other galaxies — but Andromeda’s proximity to us means gravity is actually pulling it closer to us. About 4.5 billion years from now, the two galaxies will collide. That sounds stressful, but since galaxies are mostly empty space, it will actually be pretty uneventful for us if we’re still here.
Keishinrei 