Multiple choice general knowledge science & technology

An astronomical unit is the average distance between the...

  1. Earth and Mars

  2. Earth and the Moon

  3. Earth and Alpha Centauri

  4. Earth and the Sun
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D Correct answer
Explanation

An astronomical unit (AU) is defined as approximately 149.6 million kilometers: the average distance between Earth and the Sun. It's used to measure distances within our solar system. The Earth-Moon distance is much smaller (about 384,000 km), and distances to other stars like Alpha Centauri are vastly larger (about 4.37 light-years or 276,000 AU).

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