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© 2003 NASA and The Hubble Heritage Team (STScI/AURA)

Galaxy Cluster Abell 1689

Hubble peered straight through the center of one of the most massive galaxy clusters known, called Abell 1689. This required that Hubble gaze at the distant cluster, located 2.2 billion light-years away, for over 13 hours. The gravity of the cluster's trillion stars — plus dark matter — acts as a 2-million-light-year-wide "lens" in space. This "gravitational lens" bends and magnifies the light of galaxies located far behind it.

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