The Scorched Silicate Surface and Rapid Orbit of Kepler-20e
Kepler-20e represents a pivotal milestone in the history of exoplanetary science. Discovered by NASA’s Kepler mission in December 2011, it was the first planet smaller than Earth ever found orbiting a Sun-like star. Located approximately 950 light-years away in the constellation Lyra, this terrestrial body occupies a brutal environment characterized by high-energy irradiation and gravitational extremes. Unlike the gas giants that dominated early exoplanetary catalogs, Kepler-20e is a dense, rocky sphere with a physical composition primarily consisting of silicates and iron, offering a stark look at the diversity of planetary systems beyond our own. Geological Composition and Internal Structure Physical models derived from its mass and radius indicate that Kepler-20e is a strictly terrestrial world. With a radius approximately 0.87 times that of Earth, it is roughly the size of Venus. However, its proximity to its host star, Kepler-20, has resulted in a density that suggests a si...