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Data sent from the Galileo spacecraft indicates that Jupiter's moon Europa has a liquid ocean under a thick crust of ice.
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Galileo (spacecraft)
First NASA mission to orbit Jupiter (1989–2003)
Galileo was an American robotic space probe that studied the planet Jupiter and its moons, as well as the asteroids Gaspra and Ida. Named after the Italian astronomer Galileo Galilei, it consisted of an orbiter and an entry probe. It was delivered into Earth orbit on October 18,…Source: Wikipedia (CC BY-SA)
Jupiter
Fifth planet from the Sun
Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a gas giant with a mass more than 2.5 times that of all the other planets in the Solar System combined and slightly less than one-thousandth the mass of the Sun. Its diameter is 11 times that of…Source: Wikipedia (CC BY-SA)
Europa (moon)
Smallest Galilean moon of Jupiter
Europa is a natural satellite (moon) of Jupiter. Being observable from Earth with common binoculars, it is one of the four Galilean moons. As such it is a planetary-mass moon; the smallest and least massive orbiting Jupiter, and slightly smaller and less massive than Earth's.…Source: Wikipedia (CC BY-SA)