Several space missions have been sent to explore Europa, including NASA's Galileo mission and the upcoming Europa Clipper mission, which is scheduled to launch in the mid-2020s. These missions will study the moon's surface and composition, as well as search for signs of life in its subsurface ocean. While the existence of extraterrestrial life on Europa is still uncertain, it is considered to be one of the most promising places in our solar system to look for it.
Enceladus, one of the moons of Saturn, is also considered a potential candidate for extraterrestrial life in our solar system. Like Europa, Enceladus is believed to have a subsurface ocean of liquid water, which was discovered by the Cassini spacecraft during its mission to Saturn. The ocean is thought to be in contact with a rocky seafloor and is heated by hydrothermal activity, which could provide the energy needed to support life.
In addition, Cassini detected plumes of water vapor and organic molecules emanating from cracks in Enceladus' icy surface, indicating that there could be hydrothermal vents on the seafloor that are similar to those found on Earth and could provide a habitat for life.
While the evidence for potential life on Enceladus is still indirect and speculative, it is an active area of research and the moon will continue to be a target of exploration by future missions to Saturn and its moons.
