dark matter

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Theoretical non-luminous matter that has eluded detection by all present means, except through gravitational interaction with luminous objects. Astronomers and astrophysicists calculate that dark matter comprises more than 90 percent of the universe. Possible sources of dark matter include undetected clumps of interstellar dust and gas, stellar remnants such as white dwarfs and neutron stars, neutrinos that have mass, and some as yet unknown form of matter.