Artist’s impression of L 98-59d

This artist’s impression shows L 98-59d, the third planet in the L 98-59 planetary system, which is 35 light-years away from Earth. The system contains four confirmed rocky planets with a potential fifth furthest from the star.

Using the Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO) instrument on ESO’s VLT, astronomers have discovered that up to 30% of L 98-59d’s mass could be water, making it an ocean world.