Dark matter makes up about 27 percent of the universe.
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According to a report from NASA’s Goddard Space Flight Center in Greenbelt, Md., a new study of gamma ray light from the center of the Milky Way galaxy makes the strongest case to date that some of this emission may arise from dark matter. The study’s most recent results appeared February 11 in the journal Physical Review D.
NASA researchers estimate that approximately 68 percent of the universe is dark energy. Dark matter makes up about 27 percent of the universe’s total mass and energy, and the rest – everything on Earth, everything ever observed with all of our instruments, all normal matter – totals to less than five percent of the universe.