mega-Earth
mega-Earth noun: a type of terrestrial planet, with masses greater than that of super-Earths. A dense planetary mass object with a solid surface and little atmosphere. An exoplanet with a mass comparable to a gas giant or ice giant, but without its massive gaseous envelope. A planet with a radius of 2 Earth radii or more, and a density of 5 g/cm³ or more.
Noun
mega-Earth (plural mega-Earths)
- A type of terrestrial planet, with masses greater than that of super-Earths. A dense planetary mass object with a solid surface and little atmosphere. An exoplanet with a mass comparable to a gas giant or ice giant, but without its massive gaseous envelope. A planet with a radius of 2 Earth radii or more, and a density of 5 g/cm³ or more.
- A post-Cthonian planet, whose gaseous envelope has completely or almost completely been stripped.
Forms of mega-Earth
| plural | mega-Earths |
|---|
Origin of mega-Earth
mega- + Earth. Treating "mega" as greater than "super". Named in relation to the term super-Earth.
Questions about mega-Earth
- What does mega-Earth mean?
- Mega-Earth means a type of terrestrial planet, with masses greater than that of super-Earths. A dense planetary mass object with a solid surface and little atmosphere. An exoplanet with a mass comparable to a gas giant or ice giant, but without its massive gaseous envelope. A planet with a radius of 2 Earth radii or more, and a density of 5 g/cm³ or more.
- What part of speech is mega-Earth?
- Mega-Earth is a noun.
- What is the plural of mega-Earth?
- The plural of mega-Earth is mega-Earths.
Words near mega-Earth in the dictionary
Source and license
Adapted from Wiktionary: mega-Earth (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.
Last updated:
Cite this entry: “mega-Earth.” Word.ws, https://word.ws/mega-earth. Based on Wiktionary, CC BY-SA 4.0.