Sub-Earth
A Sub-Earth is a low-mass terrestrial planet with at least the mass of our Moon (0.01 M⊕) to half the mass of the Earth at most. There are two sub-Earths in our solar system: Mercury (0.055 M⊕) and Mars (0.107 M⊕).
As of 2008 out of 300 known exoplanets, there is only one known sub-Earth exoplanet, orbiting the pulsar , discovered in 1994. The planet has mass only 2 Lunar masses. Future space telescopes like Kepler should be able to search for this type of planets orbiting the normal stars.
As of 2008 out of 300 known exoplanets, there is only one known sub-Earth exoplanet, orbiting the pulsar , discovered in 1994. The planet has mass only 2 Lunar masses. Future space telescopes like Kepler should be able to search for this type of planets orbiting the normal stars.
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