Decaying dark matter should be visible here in the Milky Way as a halo around the galaxy
Astronomers are very sure that dark matter exists, but they’re not sure at all what it’s made of. The problem is that it isn’t just dark, it’s invisible. As far as we know, dark matter doesn’t emit light, absorb light, reflect light, refract light, scatter light, diffract light, or really have anything to do with …
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