red dwarf

noun

Definition of red dwarf 

: a star having substantially lower surface temperature, intrinsic luminosity, mass, and size than the sun

Examples of red dwarf in a Sentence

Recent Examples on the Web

Planets orbiting close to a red dwarf usually have one side that is in constant daylight, while the other experiences constant nighttime. Loren Grush, The Verge, "NASA’s newest spacecraft will scour the galaxy for undiscovered planets," 12 Apr. 2018 The celebrated Trappist-1 star, with at least seven Earth-size terrestrial planets, is an ultra-cool red dwarf that's just a little bigger than Jupiter. Marcia Dunn, The Christian Science Monitor, "NASA's Tess spacecraft on a mission to find new planets," 13 Apr. 2018 The celebrated Trappist-1 star, with at least seven Earth-size terrestrial planets, is an ultra-cool red dwarf that's just a little bigger than Jupiter. Fox News, "NASA Tess spacecraft to prowl for planets as galactic scout," 13 Apr. 2018 Mendez works at the University of Puerto Rico at Arecibo, training the telescope toward red dwarf star systems that have planets, to understand more about their habitability. Sarah Scoles, WIRED, "Puerto Rico's Observatory Is Still Recovering From Hurricane Maria," 15 June 2018 The idea was first announced in a 2015 study, which focused on Scholz’s Star, a small red dwarf with an orbiting brown dwarf that lies some 20 light years away from Earth. Jason Daley, Smithsonian, "70,000 Years Ago, a Passing Star Shook Up Our Solar System," 22 Mar. 2018 The celebrated Trappist-1 star, with at least seven Earth-size terrestrial planets, is an ultra-cool red dwarf that's just a little bigger than Jupiter. Marcia Dunn, The Christian Science Monitor, "NASA's Tess spacecraft on a mission to find new planets," 13 Apr. 2018 The celebrated Trappist-1 star, with at least seven Earth-size terrestrial planets, is an ultra-cool red dwarf that's just a little bigger than Jupiter. Fox News, "NASA Tess spacecraft to prowl for planets as galactic scout," 13 Apr. 2018 The celebrated Trappist-1 star, with at least seven Earth-size terrestrial planets, is an ultra-cool red dwarf that’s just a little bigger than Jupiter. Washington Post, "NASA Tess spacecraft to prowl for planets as galactic scout," 12 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'red dwarf.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of red dwarf

1926, in the meaning defined above

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Last Updated

23 Aug 2018

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The first known use of red dwarf was in 1926

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