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When galaxies collide, you get… a heron?

20 Dec 2019, 14:00 UTC
When galaxies collide, you get… a heron? NSF’s National Optical-Infrared Astronomy Research Laboratory/Gemini Observatory/AURA

Boy oh boy, do I love me a good galaxy collision.

Galaxies are collections of billions (or, for big ones, hundreds of billions) of stars, sometimes with lots of gas and dust, surrounded by a halo of invisible dark matter. On the whole they’re pretty big, tens or hundreds of thousands of light years across.

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