Basic Astronomical Data

Jupiter has an equatorial diameter of about 143,000 km (88,900 miles) and orbits the Sun at a mean distance of 778 million km (483 million miles). Of special interest are the planet's low mean density of 1.33 g/cm3 (0.77 oz/in3)— in contrast with Earth's 5.52 g/cm3

(3.19 oz/in3)—coupled with its large dimensions and mass and short rotation period. The low density and large mass indicate that Jupiter's composition and structure are quite unlike those of Earth

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