A) Mean distance from the centre of the sun to the centre of the earth
B) Mean distance between the surfaces of the sun to the surface of the earth
C) Maximum distance between the sun and the earth
D) Minimum distance between the sun and the earth
Correct Answer: A
Solution :[a] Astronomical unit (AU, or au), a unit of length effectively equal to the average, or mean, distance between Earth and the Sun, defined as 149,597,870.7 km (92,955,807.3 miles). The astronomical unit provides a convenient way to express and relate distances of objects in the solar system and to carry out various astronomical calculations. For example, stating that the planet Jupiter is 5.2 AU (5.2 Earth distances) from the Sun and that Pluto is nearly 40 AU gives ready comparisons of the distances of all three bodies.
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