News & AnalysisAstronomy

Cold Almost-Stars May Herald Hordes of Unseen Lurkers

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Science  18 Mar 2011:
Vol. 331, Issue 6023, pp. 1377
DOI: 10.1126/science.331.6023.1377

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Astrophysicists have discovered the coldest brown dwarf ever seen, with a temperature of 300 kelvin, they report in the 20 March Astrophysical Journal Letters. That's about as warm as a bright summer day on Earth. Meanwhile, other astronomers have found another very cold brown dwarf whose estimated temperature is about 370 K, they report in an upcoming paper in The Astrophysical Journal. The first dwarf is 200 K cooler than the previous record-holder.

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