exoplanet

noun

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

Examples of exoplanet in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Scientists can draw on it to identify and study 100,000 exoplanets, hundreds of millions of galaxies, billions of stars, and rare objects and phenomena — including some that astronomers have never witnessed before. Richard Tribou, The Orlando Sentinel, 1 May 2026 That’s unfortunate, as a number of important phenomena, from the earliest galaxies to the features of exoplanet atmospheres, are only detectable at infrared wavelengths. John Timmer, ArsTechnica, 23 Apr. 2026 Grillmair's research included dark matter, Galactic structure, stellar populations, and exoplanets, according to CalTech. Jeanine Santucci, USA Today, 23 Apr. 2026 Investigators will mostly be looking for exoplanets, using a technique called gravitational lensing. Elizabeth Howell, Space.com, 21 Apr. 2026 See All Example Sentences for exoplanet

Word History

First Known Use

1992, in the meaning defined above

Time Traveler
The first known use of exoplanet was in 1992

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Cite this Entry

“Exoplanet.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/exoplanet. Accessed 5 May. 2026.

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