* Astronomy

 Spy telescopes could help NASA pin down dark energy

The telescopes were designed for spying down on the Earth, but the Pentagon decided they weren't needed after all and in January 2011 offered them to NASA. The space agency has since been contemplating its windfall, and on 4 June unveiled a plan to use one of the telescopes for the Wide-Field Infrared Survey Telescope (WFIRST) mission.
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