Question

Define light year and astronomical unit.

March 22, 2025

Answer

Light Year: A light year (ly) is the distance travelled by light in one year in a vacuum. 1 ly = 9.46 × 10¹⁵ m.

Astronomical unit: An astronomical unit (AU) is the average distance between the Earth and the Sun. 1 AU = 1.5 × 10¹¹ m.

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