NASA's planet-hunting telescope found an Earth-size exoplanet 100 light-years away. It could hide a vast ocean.

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· *Astronomers have discovered a new Earth-sized planet outside our solar system*, named TOI 700 d, 100 light-years away.
· The planet is in *its star's habitable zone* and has the potential to hold liquid water.
· *F**uture research could give scientists more information about the planet's surface and atmosphere. *

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