Assertion: brown dwarf | /r/HasProperty | a type of substellar object
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Source sentences:
text: A brown dwarf is a type of substellar object that has a mass between those of the heaviest gas giant planets and the least massive stars, i.e., approximately 13 to 75–80 times that of Jupiter ( M J ), or approximately 2.5×1028 kg to about 1.5×1029 kg.