exo·​plan·​et ˈek-sō-ˌpla-nət How to pronounce exoplanet (audio)
: a planet orbiting a star that is not our sun

Examples of exoplanet in a Sentence

Recent Examples on the Web Those included directly imaging nearby exoplanets—including Earth-sized worlds at the right distance from their stars to have liquid water—and seeing back to the era of the universe that birthed the very first galaxies. Phil Plait, Scientific American, 23 Nov. 2023 But oxygen by itself does not point automatically to life, explains Eliza Kempton, an astronomer at the University of Maryland who specializes in exoplanets. Dan Falk, Smithsonian Magazine, 29 Jan. 2024 Batalha’s whiteboard is filled with jottings, notes for a proposal to observe several exoplanets, including twin Neptunelike planets orbiting a star more than 160 light years away from our sun. Martha Ross, The Mercury News, 25 Jan. 2024 Its orbit is unusually long for an exoplanet this size: 146 days. Jennifer Ouellette, Ars Technica, 11 Jan. 2024 To investigate this, my group has led the first investigation on the spin-axis variations of exoplanets. Gongjie Li, Discover Magazine, 11 Jan. 2024 This possibility has implications for the formation of Earth and other planets, including exoplanets around other stars. Tom Metcalfe, Scientific American, 2 Dec. 2023 Since 1992, scientists have spotted more than 5,400 exoplanets. WIRED, 26 Nov. 2023 Share [Findings] The exoplanet NGTS-10b was found to have a year lasting eighteen Earth hours and to be at risk of falling into its star. Rafil Kroll-Zaidi, Harper's Magazine, 17 Jan. 2024 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'exoplanet.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1992, in the meaning defined above

Time Traveler
The first known use of exoplanet was in 1992

Dictionary Entries Near exoplanet

Cite this Entry

“Exoplanet.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/exoplanet. Accessed 22 Feb. 2024.

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