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Caption: The planets move in space, circling the Sun. This movement is called revolution. One complete revolution of a planet around the Sun corresponds to the planets year. Traveling this way around the Sun, each planet spins like a top on its axis, which is a kind of imaginary stick that runs right through the middle of the planet. This movement is called rotation. One complete rotation corresponds to the planets day.
Credit: Album / Universal Images Group
Image size: 3136 × 1635 px | 14.7 MB
Print size: 26.6 × 13.8 cm | 1234.6 × 643.7 in (300 dpi)