Out in the depths of space, collisions of enormous objects can occur on an almost unimaginable scale. Entire galaxies can collide, with two galaxies merging into one object and producing a storm of star formation as clouds of dust and debris from each galaxy are shoved together and fuel the birth of new stars.
This merger was originally spotted by volunteers using the Galaxy Zoo citizen science project. Members of the public were invited to help comb through Hubble data and classify different types of galaxies that could be seen in the images, to create a catalog of galaxy types.
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Those aliens are having a bad day.