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TRAPPIST-1 Planets Probably Rich in Water

5 Feb 2018, 16:00 UTC
TRAPPIST-1 Planets Probably Rich in Water ESO/M. Kornmesser

A new study has found that the seven planets orbiting the nearby ultra-cool dwarf star TRAPPIST-1 are all made mostly of rock, and some could potentially hold more water than Earth. The planets' densities, now known much more precisely than before, suggest that some of them could have up to 5 percent of their mass in the form of water — about 250 times more than Earth's oceans.

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