brown dwarf
noun
: a celestial object that is much smaller than a normal star and has insufficient mass to sustain nuclear fusion but that is hot enough to radiate energy especially at infrared wavelengths
Examples of brown dwarf in a Sentence
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The brown dwarf creates gravitational instability at distances equivalent to the distance between Mars and the sun, but this didn't prevent planets from forming in the system.
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Robert Lea, Space.com, 23 June 2026
The James Webb Space Telescope has found nearby brown dwarfs masquerading as far-distant galaxies.
—Phil Plait, Scientific American, 19 June 2026
Amid all the new stars lie even greater numbers of brown dwarfs and also less massive objects, around the physical size of Jupiter (and smaller), that simply didn’t grow big enough quickly enough to become stars on their own.
—Big Think, 30 Apr. 2026
What’s left is likely to be a large gas giant, possibly somewhere between Jupiter and a brown dwarf star in mass.
—ArsTechnica, 2 Jan. 2026
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Robert Lea, Space.com, 23 June 2026
The James Webb Space Telescope has found nearby brown dwarfs masquerading as far-distant galaxies.
—Phil Plait, Scientific American, 19 June 2026
Amid all the new stars lie even greater numbers of brown dwarfs and also less massive objects, around the physical size of Jupiter (and smaller), that simply didn’t grow big enough quickly enough to become stars on their own.
—Big Think, 30 Apr. 2026
What’s left is likely to be a large gas giant, possibly somewhere between Jupiter and a brown dwarf star in mass.
—ArsTechnica, 2 Jan. 2026
See All Example Sentences for brown dwarf
Cite this Entry
“Brown dwarf.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/brown%20dwarf. Accessed 24 Jun. 2026.
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