Feb 21, 2018 | Updated: 09:54 AM EDT
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First glimpse of TRAPPIST-1 planets shows some could hold more water than Earth

Astronomers have discovered seven earth-sized exoplanets orbiting the dwarf star TRAPPIST-1 could potentially hold 250 times more water than earth's oceans. Studies also show the planets are made mostly of rock, marking them as more similar to earth than gas giants.

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