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Date: 2014-08-01 12:37:00Space European Space Agency X-ray telescopes Astrophysics Cosmic Vision XMM-Newton Great Observatories program Fermi Gamma-ray Space Telescope Pulsar Space telescopes Spacecraft Spaceflight | Chandra & XMM-Newton Provide Direct Measurement of Distant BlackAdd to Reading ListSource URL: pcos.gsfc.nasa.govDownload Document from Source WebsiteFile Size: 4,24 MBShare Document on Facebook |