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A comment on Free-Floating Planets May be More Common Than Stars . Parent comment
Basicly, there is not enough baryonic matter (stuff like protons and neutrons) in the universe to explain the observed effects of dark matter without invalidating a lot of other observations.
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Basicly, there is not enough baryonic matter (stuff like protons and neutrons) in the universe to explain the observed effects of dark matter without invalidating a lot of other observations.