Andromeda is speeding toward us at 250,000 mph. We will collide with each other in 4 billion years. We will be caught up in the biggest event in our planet's´ history when these giants collide with each other. Although astronomers think that earth will survive the two galaxies colliding. The collision will happen right in front of us and we we see the night sky the way nobody has ever seen it before. Andromeda is 2.5 billion light years from Earth.