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An Astronomical Unit is a unit of distance measure defined as the mean (average) distance between the Earth and the Sun; thus, the earth orbits the sun at a distance of 1 Astronomical Unit. The Astronomical Unit was invented to make it easier to think of astronomical distances within the Solar System ... it is easier to get a feel for how close the planets and other bodies in the solar system are close to the sun in terms of Astronomical Units (AUs) than millions of kilometers: Mercury at 0.4 AU versus 50 million kilometers, Venus at 0.7 AU versus 108 million kilometers, etc.

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Q: Which planet is one astonomical unit from the sun?
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