Astronomers using NASA's Hubble Space Telescope observed the smallest exoplanet where water vapor has been detected in the atmosphere.
Two exoplanets – Kepler-138 c and Kepler-138 d – appear to have oceans at least 1,600 km deep. That’s about 500 times deeper than the average depth of Earth’s oceans. However, they could be much warmer and under very high pressure.
It's called TOI-1452b, and measurements of its size and mass suggest a density profile consistent with a global liquid ocean. An exoplanet is just 100 light-years from Earth
