Optical Photo of Galaxy Cluster (IMAGE)

Center for Astrophysics | Harvard & Smithsonian

Optical Photo of Galaxy Cluster

Caption

This optical image of the newfound galaxy cluster highlights how faint and reddened these galaxies are due to their great distance. The cluster remained hidden until the South Pole Telescope spotted it by looking for distortions in the cosmic microwave background. (Such distortions are called the Sunyaev-Zel'dovich effect.) The blue streak is a satellite passing through the field of view during the timed exposure. The field of view is 4 x 4 arcminutes.

Credit

CTIO/J. Mohr (LMU Munich)

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