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