Linking the twin, 10-meter telescopes in Hawaii, astronomers at the W. M. Keck Observatory discovered an extended, double-layered dust disk orbiting 51 Ophiuchi, a star that is 410 light-years from Earth. It is the first time the Keck Interferometer Nuller instrument has identified such a compact cloud around a star so far away.
http://www.spacedaily.com/reports/Keck_Twin_10_meter_Telescopes_Spot_Double_Dust_Cloud_999.html
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