MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
An artist's impression of the Milky Way galaxy colliding with Andromeda. Our galaxy, the Milky Way, is moving towards the Andromeda galaxy. Astronomers predict that in about 4 billion years, the two galaxies will collide and begin to merge. The Solar System's fate is uncertain. It might end up in the final, larger galaxy, orbiting further from the core than it does now, or it might be ejected into space altogether.
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