Size comparison of Kepler-10c, a Mega-Earth, with Earth and Neptune

A mega-Earth is a massive terrestrial exoplanet that is at least ten times the mass of Earth. Mega-Earths are substantially more massive than super-Earths (terrestrial and ocean planets with masses around 5–10 Earths). The term "mega-Earth" was first coined in 2014, when Kepler-10c was revealed to be a Neptune-mass planet with a density considerably greater than that of Earth.[1][2]

List of Mega-Earth exoplanets

Planet Star system Location Distance Constellation Mass
Surface gravity Orbit Notes
Right Ascension Declination Period Size
Kepler-10c Kepler-10 19h 02m 43s +50° 14 29 584 ly (179 pc) Draco 17.2 2.34 7.100 45.3 days 0.24
K2-3d K2-3 11h 29m 20.39s −01° 27 17.2 137 ly (42 pc) Leo 7.50 1.61 11.7 44.6 days 0.2
BD+20594b BD+20 594 03h 34m 36.23s +20° 35 57.2 496.08 ly (152.10 pc) Aries 16.3 2.23 7.890 41.69 days 0.241


  1. Sasselov, Dimitar (2 June 2014) Exoplanets: From Exhilarating to Exasperating, 22:59, Kepler-10c: The "Mega-Earth", YouTube
  2. "Astronomers Find a New Type of Planet: The "Mega-Earth"2014-14".

See also

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