exoplanet

noun
exo·​plan·​et | \ ˈek-sō-ˌpla-nət How to pronounce exoplanet (audio) , ˌek-sō-ˈpla-\

Definition of exoplanet

: a planet orbiting a star that is not our sun

Examples of exoplanet in a Sentence

Recent Examples on the Web

Merrin Peterson, a graduate student from the Institute for research on exoplanets is the lead author on the study. Chris Ciaccia, Fox News, "Exoplanet 'twice the size of Earth' discovered 145 light-years away," 6 Sep. 2018 But while humanity has proven great at finding exoplanets attached to stars, scientists have only identified a dozen or so rogues. David Grossman, Popular Mechanics, "Two More Mysterious Rogue Planets Found," 9 Nov. 2018 An exoplanet twice the size of Earth, known as Wolf 503b, has been found just 145 light-years away from our home planet. Chris Ciaccia, Fox News, "Exoplanet 'twice the size of Earth' discovered 145 light-years away," 6 Sep. 2018 The Transiting Exoplanet Survey Satellite mission, launched in April and declared operational in late November, will find an estimated 14,000 exoplanets. Joe Pappalardo, Popular Mechanics, "We're Recreating Alien Atmospheres on Earth To Search for Life Beyond the Solar System," 20 Dec. 2018 But for an exoplanet with a moon, the brightness dips don’t seem to follow an orderly scheme. Loren Grush, The Verge, "Astronomers may have discovered the first moon ever found outside our Solar System," 3 Oct. 2018 But in clumps where stars are spread farther apart, exoplanets could still manage to survive. Nola Taylor Redd, Space.com, "Omega Centauri Is a Terrible Place to Look for Habitable Planets," 15 Aug. 2018 In the last 20 years, thanks to exoplanet-hunting missions like Kepler, that there are more planets than stars in our galaxy. Brian Resnick, Vox, "What humpback whales can teach us about alien languages," 6 Dec. 2018 So when scientists recently discovered the seven exoplanets of Trappist-1, NASA's visual artists had their work cut out for them. Sarah Scoles, WIRED, "The Case of the Evaporating Exoplanets," 12 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'exoplanet.' 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 exoplanet

1992, in the meaning defined above

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Last Updated

5 Mar 2019

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The first known use of exoplanet was in 1992

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More from Merriam-Webster on exoplanet

Britannica English: Translation of exoplanet for Arabic Speakers

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