Dark matter—an unseen substance thought to make up 27 percent of the universe—is one of space science’s great mysteries. It does not reflect or emit any light, so spotting it is difficult. But a new ...

Uncover the mystery of the gamma ray glow at the Milky Way's center. New simulations suggest dark matter collisions could ...

Light behaves as both a wave and a particle, a paradox that has resisted complete explanation for over a century despite ...