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Jupiter is the largest planet in the solar system and its volume of 1340 billion km3 can be seen from Earth with the naked eye. The planet is the fifth planet from the Sun. It has 63 known moons and is thought to have over 100 moons. Jupiter also has the fastest rotational speed. One Jupiter-day lasts approximately 10 hours. The atmosphere primary consists of hydrogen and helium. The average temperature on Jupiter is -121°C.