The video from Moomoo Math and Science explains the different units used to measure distances in space: kilometers, astronomical units (AU), and light years.
Kilometers are used to measure smaller distances, like the diameter of planets. A kilometer equals 1,000 meters, and a meter is based on the distance light travels in a fraction of a second.
Astronomical Units (AU) are used to measure distances within the solar system. One AU is the average distance from the Earth to the Sun—about 150 million kilometers.
Light years are used for extremely large distances, like the distance to stars and galaxies. One light year equals about 9.46 trillion kilometers. For example, Polaris is 430 light years away, and the center of the Milky Way is 26,000 light years away.
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