"It is commonly believed that our own Milky Way is on a collision course with the neighbouring galaxy... predicted in around five billion years. But there's no certainty of a Milky Way-Andromeda collision."
"Astronomers have long known that Andromeda and the Milky Way are being drawn together by the forces of gravity. They are expected to come together in about 4.5 billion years and form a giant 'elliptical galaxy' - shaped like a stretched circle, NASA says."
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