Astronomers have wondered for ages about the existence of dark matter. The truth is astronomers aren't sure what dark matter is made of, but they think that it does exist in space. Dark matter is thought to exist as large black rings surrounding galaxies. The space between planets and stars isn't just nothing, it's probably matter of some sort. The consensus seems to be that it's made up of small subatomic particles called MACHOs (MAssive Compact Halo Objects) and WIMPs (Weakly Interacting Massive Particles). They aren't as big as atoms, but they're made of the
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