The more you learn about cosmology, the weirder it gets.🙄
,"we are much more certain what dark matter is not than we are what it is".
To begin with, astronomers know it is utterly dark, unlike the stars and planets we know. It's also not like dark clouds of ordinary matter formed up of particles known as baryons. Dark matter isn't antimatter either because we don't witness the distinctive gamma rays created when antimatter collides with the matter. Finally, based on the number of gravitational lenses observed, we can rule out enormous galaxy-sized black holes, too.
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