The Hubble Telescope team has discovered the potential for "substantial amounts of water" on four of seven Earth-sized planets found earlier this year, Axios writes. The system of planets orbits a star called TRAPPIST-1 and is about 40 light years from our own planet.
By measuring the ultraviolet light on the planets and the amount of hydrogen leaving them, "results suggest the innermost planets, TRAPPIST-1B and TRAPPIST-1C, could have lost as much as 20 Earth-oceans-worth of water in the last eight billion years," Popular Mechanics writes. "The outer planets, however, including E, F, and G, which orbit in the habitable zone, would have lost less water, and could still retain vast stores of liquid water on the surface."
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