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Dark matter maps reveal cosmic scaffolding
Refregier, Alexandre; Ellis, Richard; Mobasher, Bahram +17 more
Ordinary baryonic particles (such as protons and neutrons) account for only one-sixth of the total matter in the Universe. The remainder is a mysterious `dark matter' component, which does not interact via electromagnetism and thus neither emits nor reflects light. As dark matter cannot be seen directly using traditional observations, very little …
A black hole in a globular cluster
Kundu, Arunav; Zepf, Stephen E.; Maccarone, Thomas J. +1 more
Globular star clusters contain thousands to millions of old stars packed within a region only tens of light years across. Their high stellar densities make it very probable that their member stars will interact or collide. There has accordingly been considerable debate about whether black holes should exist in these star clusters. Some theoretical…