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Which planets orbit less than 1 Astronomical Unit from the Sun?

April 26, 2017astronomical Orbit planets Sun

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Which planets orbit less than 1 Astronomical Unit from the Sun?

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Mercury and Venus both orbit the sun at less than 1 astronomical unit (AU). Mercury orbits the sun at an average distance of .387 AU (about 58 million km) and Venus orbits at an average distance of .723 AU (about 108 million km). Compare these distances to 1 AU which is about 150 million km, which happens to be the average sun to earth distance; which defines the astronomical unit.