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Astronomical Distance Converter

Convert between cosmic distance units

About Astronomical Distance Conversion

Astronomical distances are so vast that everyday units become impractical. The astronomical unit (AU) represents the Earth-Sun distance (~150 million km). A light-year is the distance light travels in one year (~9.46 trillion km). A parsec (~3.26 light-years) is based on stellar parallax measurement.

The nearest star (Proxima Centauri) is 4.24 light-years away. Our galaxy is about 100,000 light-years across. These conversions help astronomers and space enthusiasts contextualize cosmic distances.