Failed Stars or Overachieving Planets?

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Science  21 Jun 2002:
Vol. 296, Issue 5576, pp. 2154-2155
DOI: 10.1126/science.1074261

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With masses between those of stars and planets, brown dwarfs remain a bit of a mystery. Are they failed stars, or giant planets that have lost their stellar companion? In his Perspective, Reid reviews recent progress toward resolving this question, which is important for understanding star formation.