This image released on Thursday March 21, 2013 by the European Space Agency (ESA) from the Planck spacecraft shows a bridge of hot gas that connects galaxy clusters about a billion light-years from ... more 
This image released on Thursday March 21, 2013 by the European Space Agency (ESA) from the Planck spacecraft shows a bridge of hot gas that connects galaxy clusters about a billion light-years from Earth. (AP Photo/ESA Planck Collaboration) less 
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Associated Press | Photo By ESA Planck Collaboration
Thu, Mar 21, 2013 12:18 PM EDT