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Astronomical Unit
An astronomical unit (AU) is a standard space measurement based on the distance from the Earth to the Sun—about 149.6 million kilometers or 93 million miles. It helps describe solar system distances in practical numbers rather than extremely large values.
Astronomers use AU values to measure orbits of planets, asteroids, and comets relative to Earth.
How Astronomical Units Make Space Understandable
Instead of writing massive kilometer values, the AU simplifies comparisons—for example, Mars orbits at about 1.5 AU from the Sun, while Jupiter is about 5.2 AU away.
For education and astronomy fans, converting AU to kilometers or lightyears gives a clearer perspective on how vast space is.
