TRAPPIST-1e is a rocky, Earth-sized exoplanet located about 39 light-years from Earth in the TRAPPIST-1 planetary system, which orbits an ultra-cool red dwarf star of spectral type M8V. It was discovered in 2017 using the transit method and is considered one of the most Earth-like planets known. The planet has a radius of about 0.91 times that of Earth and a mass of roughly 0.77 Earth masses, giving it a density close to Earth’s (~5.65 g/cm³). This density strongly indicates a solid rocky surface with an iron core rather than a thick gaseous envelope. Surface gravity is estimated to be around 93% of Earth’s gravity, meaning a human would feel only slightly lighter there. TRAPPIST-1e orbits extremely close to its host star at a distance of about 0.029 astronomical units and completes one full orbit in approximately 6.1 Earth days. Because of this close orbit, the planet is almost certainly tidally locked, with one hemisphere permanently facing the star and the other in constant night. D...
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