Inference then Observation
Gallery:
Site Images Almost all of the bright objects in this Hubble Space Telescope image are galaxies in the cluster known as Abell 2218. The cluster is so massive and so compact that its gravity bends and focuses the light from galaxies that lie behind it. As a result, multiple images of these background galaxies are distorted into long faint arcs – a simple lensing effect analogous to viewing distant street lamps through a glass of wine.
