Multiple choice

'Parsec' is the unit of measurement of

  1. density of stars

  2. astronomical distance

  3. brightness of heavenly bodies

  4. orbital velocity of giant stars
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B Correct answer
Explanation

A parsec, short for parallax second, is a unit of length used to measure large distances to astronomical objects outside the Solar System. One parsec is equal to about 3.26 light-years. Therefore, it measures astronomical distance.

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