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Galaxy collisions and star-formation: a surprising causal examination

12 Sep 2019, 13:00 UTC
Galaxy collisions and star-formation: a surprising causal examination ESA/Hubble, NASA

The fundamental constituents of galaxies are stars, gas, dust, black holes, and dark matter. The extent to which we understand each of them and their interplay varies greatly. Yet current understanding drives us to acknowledge that the growth of the mass of galaxies must be driven by either active star-formation, galaxy-galaxy mergers, or both. But which of these two effects dominates is an ongoing mystery nearly as old as the discovery of galaxies themselves.

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