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 The star, Gliese 887, is a small, dim red dwarf star with about half the mass of our sun. Ashley Strickland, CNN, "Astronomers find super-Earths orbiting a star 11 light-years away," 25 June 2020 The star, known as GJ887, is a red dwarf that's roughly half as massive as our sun. Doyle Rice, USA TODAY, "'Nearby' star may have three Super-Earths," 25 June 2020 Our yellow sun, for instance, is not so mediocre in a galaxy where red dwarf stars are the norm. Charlie Wood, Popular Science, "The Milky Way could have dozens of alien civilizations capable of contacting us," 18 June 2020 Many of the Earth-size exoplanets discovered in recent years orbit small red dwarf stars, rather than sun-like stars. Ashley Strickland, CNN, "Astronomers may have found an Earth-like exoplanet orbiting a sun-like star," 5 June 2020 Exoplanets have been found orbiting stars similar to our sun, or those lower in mass, like small red dwarf stars. Ashley Strickland, CNN, "Astronomers are changing the way we think of 'potentially habitable' planets," 4 May 2020 Its star, a red dwarf, is considerably smaller and cooler than our sun, a yellow dwarf, and its atmosphere is also different than ours. Washington Post, "Water, temperature right for life at another star’s planet," 11 Sep. 2019 But Kepler-1649c orbits a red dwarf star, much smaller and cooler than our sun. Ashley Strickland, CNN, "New potentially habitable exoplanet is similar in size and temperature to Earth," 15 Apr. 2020 The most common star in our galaxy is a red dwarf, smaller and dimmer than the Sun. John Timmer, Ars Technica, "Super-Earth at a nearby star is a Mercury-like hunk of rock," 20 Aug. 2019

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.

See More

First Known Use of red dwarf

1926, in the meaning defined above

Keep scrolling for more

Learn More about red dwarf

Time Traveler for red dwarf

Time Traveler

The first known use of red dwarf was in 1926

See more words from the same year

Statistics for red dwarf

Last Updated

29 Jun 2020

Cite this Entry

“Red dwarf.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/red%20dwarf. Accessed 8 Jul. 2020.

More from Merriam-Webster on red dwarf

Thesaurus: All synonyms and antonyms for red dwarf

Comments on red dwarf

What made you want to look up red dwarf? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

A More Exception(al) Quiz

  • hot dog  hot dog  hot dog  hot dog cat
  • Which of the following words is not a synonym for ‘a young person’?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Citation

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!