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  Bridging Cities of Galaxies
Bridging Cities of Galaxies
Image credit: Sunyaev–Zel’dovich effect: ESA Planck Collaboration; optical image: STScI Digitized Sky Survey

Uploader comment: Planck has discovered a bridge of hot gas that connects galaxy clusters Abell 399 (lower center) and Abell 401 (top left). The galaxy pair is located about a billion light-years from Earth, and the gas bridge extends approximately 10 million light-years between them.


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November 30, 2012, 5:24 am
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