= Units of measurement in astronomy
{wiki=Category:Units_of_measurement_in_astronomy}
Units of measurement in astronomy are crucial for quantifying astronomical distances, sizes, masses, and other physical properties of celestial objects. Here are some of the key units commonly used in the field: \#\#\# 1. **Distance** - **Astronomical Unit (AU)**: The average distance from the Earth to the Sun, approximately 93 million miles or about 150 million kilometers. - **Light-Year (ly)**: The distance that light travels in one year, approximately 5.
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