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Bridging Cities of Galaxies – NASA Image

Wednesday, November 21, 2012 8:50

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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.
The image shows the two galaxy clusters as seen at optical wavelengths with ground-based telescopes and through the Sunyaev-Zel’dovich effect (in orange) with the Planck satellite.

Image credits: Sunyaev–Zel’dovich effect: ESA Planck Collaboration; optical image: STScI Digitized Sky Survey

http://www.nasa.gov/mission_pages/planck/multimedia/pia16466.html

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