TRAPPIST-1: System with 7 Earth-Size Exoplanets

The ultracool star TRAPPIST-1, located about 40 light-years from Earth, hosts at least seven exoplanets, most likely rocky worlds the size of Earth and smaller. The star boasts not only the largest number of Earth-like worlds in a single system known to date, but also the most planets that could host liquid water on their surfaces.

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