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Europa is one of Jupiter's four largest moons, discovered by Galileo in the early 1600s. It matters because scientists believe it has a subsurface ocean of liquid water beneath its icy crust, making it a promising place to search for extraterrestrial life.
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Apparent magnitude 5.29 (opposition) Atmosphere Surface pressure 0.1 μPa (10 bar)
Europa (/jʊˈroʊpə/ ) is the smallest and least massive of Jupiter's four Galilean moons. It is observable from Earth with common binoculars and is a planetary-mass moon, slightly smaller and less massive than Earth's Moon. Europa is an icy moon, and, of the three icy Galilean moons, the closest orbiting Jupiter. As a result, it exhibits a relatively young surface shaped by tidal heating.