What happens to our Solar System including the Earth, when our Galaxie collides with Andromeda in future?
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Answer:
By the time that happens the Earth will have already been destroyed by the sun. But if the Earth was still around, it is highly unlikely that we would collide with any matter at all, since space is mostly just dust and emptiness, believe it or not. We would likely have a higher-than-usual amount of dust moving about the solar system, however.
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Earth and its Sun won't be around when the Andromeda Galaxy collides with the Milky Way. Our Sun has about 4.5^9 years more to go before it swells into a red giant and engulfs Earth. The Andromeda Galaxy is approaching our Milky Way at about 300 km per second. At that velocity, it will take it another 6.6^11 years to arrive.
When the collision occurs, both the Milky Way and the Andromeda Galaxy will be altered significantly. A few stars might collide, but the distance between stars is so vast that collisions will be rare.
For an actual photo of galaxies colliding, see this website:
http://antwrp.gsfc.nasa.gov/apod/ap02050...
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