Jupiter is the largest planet in the solar system. Fittingly, it was named after the king of the gods in Roman mythology. In a similar manner, the ancient Greeks named the planet after Zeus, the king of the Greek pantheon.
Jupiter helped revolutionize the way we saw the universe and ourselves in 1610, when Galileo discovered Jupiter's four large moons. This was the first time that celestial bodies were seen circling an object other than Earth, major support of the Copernican view that Earth was not the center of the universe.
Saturn is the sixth planet from the sun and the second-largest in the solar system, after Jupiter. It is a gas giant with an average radius about nine times that of Earth It has only one-eighth the average density of Earth, but with its larger volume Saturn is over 95 times more massive. Saturn is named after the roman god of agriculture; its astronomical symbol represents the god's sickle.
Uranus is the seventh planet from the sun. It has the third-largest planetary radius and fourth-largest planetary mass in the solar system Uranus is similar in composition to naptune, and both have bulk chemical compositions which differ from that of the larger gas giantsjupiter and saturn.