brown dwarf

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Related to T dwarf: Failed star

brown dwarf

n.
A celestial body that is more massive than a gas giant planet but has insufficient mass to sustain the hydrogen fusion reactions that produce radiant energy in normal stars.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

brown dwarf

n
(Astronomy) a type of celestial body midway in mass between a large planet and a small star
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

brown′ dwarf′


n.
a cold, dark star that is too small to initiate the nuclear reactions that generate heat and light.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

brown dwarf

(broun)
A celestial body that is similar to a star but does not emit light because it does not have enough mass to ignite internal nuclear fusion. See Note at dwarf star.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Translations
ruskea kääpiö
barna törpe
brun dverg
brun dvärg
References in periodicals archive ?
Shown here (left to right) are the Sun (facing page), a low-mass M dwarf star, an L dwarf, a T dwarf, a Y dwarf, and Jupiter, plotted to scale.
T dwarfs: Middle-aged and cooler, these failed stars come in around 1200 K (1700[degrees]F) and have methane in their atmospheres.