'Groupie' galaxies orbiting Milky Way tell us about dark matter, how galaxy formed

We live in a big-city galaxy. The Milky Way is so big it has satellite galaxies that orbit it, just as the Moon orbits the Earth. These arrangements tell us a great deal about the secrets of the universe—from how galaxies form to the mysterious nature of dark matter.

from Phys.org - latest science and technology news stories https://ift.tt/3dUJ7Be

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