SciencefromThe Atlantic6 days agoDay 21 of the 2025 Space Telescope Advent Calendar: Warped SpaceGalaxy Cluster Abell 209's mass warps and magnifies background galaxies via gravitational lensing, producing stretched and smeared clumps visible in Hubble images.
OMG sciencefromThe Atlantic3 weeks agoDay 3 of the 2025 Space Telescope Advent Calendar: A Galactic ClusterGalaxy Cluster Abell 209 contains over 100 galaxies about 2.8 billion light-years away whose combined mass gravitationally lenses and stretches background galaxies.