Etymology

mega-Earth

Today it 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. Full definition →

English Earth ← Ancient Greek μέγᾰς (mégăs) ← Proto-Hellenic *mégas
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The story

  1. Proto-Indo-European*méǵh₂s
  2. Proto-Hellenic*mégas
  3. Ancient Greekμέγᾰς (mégăs)
  4. Englishmega-
  5. EnglishEarth
  6. English todaymega-Earth

mega- + Earth. Treating "mega" as greater than "super". Named in relation to the term super-Earth.

Etymology from Wiktionary, CC BY-SA 4.0.