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Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a giant planet with a mass one-thousandth that of the Sun, but two and a half times that of all the other planets in the Solar System combined. Jupiter is a gas giant, along with Saturn, with the other two giant planetsUranus and Neptune, being ice giants. Jupiter was known to astronomers of ancient times.[12] The Romans named it after their god Jupiter.[13] When viewed from Earth, Jupiter can reach an apparent magnitude of −2.94, bright enough for its reflected light to cast shadows,[14] and making it on average the third-brightest object in the night sky after the Moon and Venus.

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