5 Things Dark Matter Might Be, According to Scientists: Galaxies

MACHO

In a contrasting acronym that’s too convenient to be accidental, the MACHO, or massive astrophysical compact halo object, is basically the opposite of the WIMP. A MACHO could be anything huge and dark made from normal matter, like non-radiating neutron stars, white dwarfs, or even planets.

The idea here is that these massive objects would be too dark to be detected by our telescopes, yet would still exert a gravitational pull on the matter around them that would make it look like there was some invisible, dark-matter-esque force out there in the universe. But just like WIMPs, studies have tested predictions about the influence of MACHOs on the universe and they’ve come up short.

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