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TRAPPIST-1's 7 Rocky Planets May Be Made of Similar Stuff The Universities of Bern, Geneva and Zurich have made astonishing discoveries about the composition of the planets of the star TRAPPIST-1. © Lead Art, Nasa/ JPL-Caltech. The TRAPPIST-1 star is home to the largest batch of roughly Earth-size planets ever found outside our solar system. An international study involving researchers from the Universities of Bern, Geneva and Zurich now shows that the exoplanets have remarkably similar densities, which provides clues about their composition. Discovered in 2016 some 40 light-years away, the...

This Star Is Home to the Largest Group of Earth-sized Planets Ever Found On 1/22/21 at 12:41 PM EST A study published in the Planetary Science Journal on Friday demonstrates that the seven planets orbiting the TRAPPIST-1 star—located around 40 light-years from the sun—have remarkably similar densities, providing insights into their composition. The star system, which was discovered in 2016, is one of the most promising targets in the search for life outside our solar system given that it is relatively close—thus fairly easy to observe—and the fact that at least three of the planets a...