One astronomical unit is the average distance between:
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Ans (a) Earth and Sun
An astronomical unit is a unit of length, roughly the distance from Earth to the Sun and approximately equal to 150 Million Kilometers (93 million miles) or 8.3 Light-Minutes.
The astronomical unit is used primarily for measuring distances within the Solar System or around other stars. It is also a fundamental component in the definition of another unit of astronomical length, the parsec.