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Sunday, August 22, 2010

Astronomy Photo of the Week

The lensing galaxy cluster Abell 1689 in the constellation Virgo. Purple overlay shows hypothesized dark matter required to create the lensing effects observed.

Abell 1689, lensing galaxy cluster in Virgo, 2.2 billion light years distant. Hubble Space Telescope. (Click for full-size image.)

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