Scientists are beginning to cull information from a small asteroid—2867 Steins—following a close flyby by Europe’s Rosetta comet chaser. The Sept. 5 encounter brought the probe to within 800 km. (495 mi.) of the target for imaging with its Osiris wide-angle optical camera. Seen in a mosaic from the flyby, Steins is the first nominal scientific target in the probe’s 11-year-plus mission to explore the nucleus of Comet 67P/Churyumov-Gerasimenko. Only 4.6 km. across, Steins is an E-type ...

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