Is there an ocean on other planets?

Yes, several celestial bodies in our solar system are believed to have oceans, either beneath their surfaces or as ice. For example, Europa, a moon of Jupiter, is thought to have a subsurface ocean beneath its icy crust. Similarly, Enceladus, a moon of Saturn, has geysers that suggest a subsurface ocean as well. Additionally, scientists believe that exoplanets outside our solar system may also have oceans, making the possibility of extraterrestrial water widespread.