Exoplanet (noun)

1. A planet that orbits a star outside of our solar system.
2. A celestial body that orbits a star, but is not a member of the solar system.

Origin:

From the prefix "exo-" meaning "outside" or "external" and the word "planet," meaning a celestial body that orbits a star. the word has been in use since the 1990s.

Examples:

1. The discovery of the exoplanet was a major breakthrough in the field of astronomy.
2. The exoplanet was found to be in the habitable zone of its star.
3. The exoplanet is similar in size and composition to Earth.
4. The exoplanet is believed to have a rocky surface.
5. The study of exoplanets is helping us to understand the formation and distribution of planets in the universe.