The planet Jupiter is the second-largest object in the solar system—only the sun is larger. Unlike rocky planets like the Earth and Mars, Jupiter is a "gas giant," made almost entirely of the elements hydrogen and helium. Jupiter's core, however, is similar to the iron and nickel core of Earth.

Photograph courtesy NASA

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Earth and the other seven planets that circle the star we call the sun and smaller objects such as moons make up our solar system.

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A planet is a large object that orbits a star