Artist’s impressions of the TRAPPIST-1 planetary system

Artist’s impressions of the TRAPPIST-1 planetary system. This artist’s impression shows several of the planets orbiting the ultra-cool red dwarf star TRAPPIST-1. New observations, when combined with very sophisticated analysis, have now yielded good estimates of the densities of all seven of the Earth-sized planets and suggest that they are rich in volatile materials, probably water.

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