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Since it cannot be detected via optical means, the composition of dark matter remains speculative. Large masses like galaxy-sized black holes can be ruled out on the basis of lensing data. Possibilities involving normal baryonic matter include [brown dwarf]?s or perhaps small, dense chunks of heavy elements. The possible amount of baryonic dark matter is, however, restricted by [big bang nucleosynthesis]?. At present, though, the most common view is that dark matter is made of elementary particles other than the usual electrons, protons, and neutrons, such as neutrinos, axion?s, or WIMPs. |
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Since it cannot be detected via optical means, the composition of dark matter remains speculative. Large masses like galaxy-sized black holes can be ruled out on the basis of lensing data. Possibilities involving normal baryonic matter include [brown dwarfs]? or perhaps small, dense chunks of heavy elements. The possible amount of baryonic dark matter is, however, restricted by [big bang nucleosynthesis]?. At present, though, the most common view is that dark matter is made of elementary particles other than the usual electrons, protons, and neutrons, such as neutrinos, axions?, or WIMPs. alternative explanations |
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