Venus is sometimes called "Earth's Twin." Venus is only 664 kilometers (400 miles) smaller than Earth. As the closest planet to Earth, Venus is usually the brightest planet in the night sky. It has also been nicknamed both the Morning Star and the Evening Star.

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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planet
planet Encyclopedic Entry

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A planet is a large object that orbits a star

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Encyclopedic entry. We live at the bottom of an invisible ocean called the atmosphere, a layer of gases surrounding our planet. Nitrogen and oxygen account for 99 percent of the gases in dry air, with argon, carbon dioxide, helium, neon, and other gases making up minute portions.