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

Sometimes, this can be quite tricky for red dwarf stars, which are notoriously tempestuous and prone to erupting in massive flares. Nadia Drake, National Geographic, "Two potentially life-friendly planets found orbiting a nearby star," 18 June 2019 Barnard’s star is also a very small and dim type of star known as a red dwarf. Loren Grush, The Verge, "A cold ‘super-Earth’ may live around a nearby star," 14 Nov. 2018 Barnard's star is a red dwarf that is only six light years from our Solar System; only the three stars of the Centauri system are closer. John Timmer, Ars Technica, "Sun’s closest solo star may have company," 14 Nov. 2018 In the 1960s, an astronomer named Peter van de Kamp claimed to have found a Jupiter-sized world around Barnard’s star after studying how the red dwarf moved. Loren Grush, The Verge, "A cold ‘super-Earth’ may live around a nearby star," 14 Nov. 2018 Earth's sun, by contrast, sits a comfortable 4.22 light-years from its nearest neighbor, the red dwarf Proxima Centauri. Nola Taylor Redd, Space.com, "Omega Centauri Is a Terrible Place to Look for Habitable Planets," 15 Aug. 2018 Most of the stars in Omega Centauri are red dwarfs, small but long-lived stars whose habitable zones are much closer in than the one surrounding our own larger sun. Nola Taylor Redd, Space.com, "Omega Centauri Is a Terrible Place to Look for Habitable Planets," 15 Aug. 2018 The team spotted three exoplanets, each slightly larger than Earth, around red dwarf star K2-155, located 200 light-years away. Doris Elin Salazar, Space.com, "Exoplanet Search Turns Up 15 New Alien Worlds, and One May Have Water," 20 Mar. 2018 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

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

28 Jun 2019

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The first known use of red dwarf was in 1926

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