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deuterium but not protium. The Working Group on Extrasolar Planets of the International Astronomical Union adopted the deuterium-burning limit (set at 13 Jupiter masses) to separate planets (below this limit) and brown dwarfs (above it). However, later work has revealed many free-floating objects labeled as brown dwarfs but with inferred masses at or well below the deuterium-burning limit. Models indicate that the exact definition of the deuterium-burning further depends on

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