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Astronomers have argued for years over whether massive galaxies form from scratch, or by chunking together smaller galaxies.
Lately, evidence is building for the latter theory, and a new study adds to the growing picture of galaxy formation as a clumpy affair. Using an array of both ground-based and space telescopes, including ESO's Very Large Telescope in Chile and the Hubble Space Telescope, a team of astronomers recently observed groups of huge galaxies in the process of merging, showing that large, established galaxies can still grow bigger.
The question was whether or not you could still form very massive galaxies at relatively recent times through these merging processes, said researcher Kim-Vy Tran of the University of Zrich, Switzerland. We saw three examples of this happening now.
Tran and colleagues observed the meshing galaxies in a group called Sg1120-12 about 4 billion light-years away
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