MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Image comparing the size of Earth (left) with the planet Jupiter. Jupiter is the fifth planet from the Sun, with an average distance from it of 5.2 times the Earth-Sun distance. Being a fluid world of mostly hydrogen and helium, astronomers label it (along with Saturn) a gas giant. With a diameter of 11.2 times that of the Earth, Jupiter is the Solar System's second largest planet.
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