Europa: The Premier Ocean World in the Search for Life Beyond Earth

To the point

Europa is the leading place to search for life beyond Earth because it likely has a long-lasting subsurface ocean beneath an ice shell with heat and chemical energy from the seafloor that could support life and exchange with the surface.

Europa: A World of Ice, With Potential for Life - NASA Science
nasa.gov

Europa: A World of Ice, With Potential for Life - NASA Science

Jupiter’s icy moon Europa may be the most promising place in the solar system to find present-day environments suitable for life beyond Earth.