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The Milky Way galaxy is on a collision course with its largest neighbor, the Andromeda galaxy. But although the galaxies are speeding towards each other at a rate of 300,000 miles per hour, the collision won't occur for another three billion years. At this point the galaxies are still 2.2 million light years apart.
The sky will grow increasingly jumbled with shreds of black dust, glowing gas, and "superclusters" of brilliant blue stars. Cold, black molecular clouds will be compressed and heated until they burst apart in a firestorm of starbirth. Supernova explosions from the most massive of the newborn stars will pepper the heavens with titanic blasts going off like a string of firecrackers.
As the stars gravitationally settle into their new home, any hint of the Milky Way and Andromeda as majestic spiral galaxies will be gone. Far-future alien skywatchers will gaze into a rich starry sky and look all the way across space into the brilliant core of our newly formed elliptical galaxy
Originally posted by d1k
How long does it take for them to finish and settle?