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IMSO 2005 Science International — Theory I Question 3

IMSO Science · IMSO 2005 Science International — Theory I

Question 3

The Astronomical Unit (AU) is a unit of length equal to the …
  1. mean distance from the Moon to the Earth.
  2. diameter of the Sun.
  3. circumference of the Earth’s orbit.
  4. circumference of the Moon’s orbit.
  5. mean distance from the Sun to the Earth.