Multiple choice

One astronomical unit (AU) is equal to:

  1. The circumference of Earth's orbit around the sun

  2. The mean distance of Earth from the sun

  3. The diameter of the sun

  4. The time required for Earth to complete one revolution
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

One astronomical unit (AU) is defined as the average distance between the Earth and the Sun, approximately 150 million kilometers.

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