The Milky Way is surrounded by about 60 satellite galaxies. The famous ones are the Large and Small Magellanic Clouds. But according to a new simulation, the Milky Way could have 80 and even 100 satellite galaxies that we haven't detected so far. These galaxies will be hard to find. They've had most of their mass stripped by the gravity of the Milky Way's halo. But new telescopes like Vera Rubin should be able to spot them.
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