a planet that revolves around a star other than the sun.
- ex·o·plan·e·tar·y, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use exoplanet in a sentence
Gliese 581g seemed to be the first rocky exoplanet to orbit its host star at the right distance for liquid water on its surface.
The story of Gliese 581g highlights how hard exoplanet-hunting is, and how science at its best is self-correcting.
Now the verdict is in: Gliese 581g is an ex-planet, not an exoplanet.
exoplanet astronomy—the search for planets orbiting other stars—has two major goals.
The same group of astronomers has also inferred a type of exoplanet that fits in between the rocky planets and the gas giants.
British Dictionary definitions for exoplanet
a planet that orbits a star in a solar system other than that of Earth
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for exoplanet
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.