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Last updated on April 17, 2014 at 17:30 EDT
Galaxy clusters connected by gas bridge
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Galaxy clusters connected by gas bridge

November 27, 2012
Planck has discovered a bridge of hot gas that connects galaxy clusters Abell 399 (lower centre) 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 ESA's Planck satellite.