SpaceWatch: A matter about dark matter

Active Bennu and hot moons, but no aliens.

A Hubble image of the massive galaxy cluster MACSJ 1206. Embedded are the distorted images of distant background galaxies, seen as arcs and smeared features. Credit: NASA, ESA, G Caminha (University of Groningen), M. Meneghetti, P Natarajan (Yale), the CLASH team, M Kornmesser (ESA/Hubble).