
thumb|300px|Comparing the size of Earth, [[Mars, and exoplanets of Kepler-20 and Kepler-42]]
thumb|300px|Comparing the size of Earth, [[Mars, and exoplanets of Kepler-20 and Kepler-42]]
A sub-Earth is a planet "substantially less massive" than Earth and Venus. In the Solar System, this category includes Mercury and Mars.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).