Arrange these astronomical units of length from the shortest to the longest: light year, astronomical unit, parsec.

Explanation

1. 01

   An astronomical unit is the mean Earth–Sun distance, about 1.5 × 10¹¹ m.

2. 02

   A light year is about 9.46 × 10¹⁵ m, roughly 63,000 astronomical units.

3. 03

   A parsec is about 3.26 light years, so it is the longest.