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Astronomical unit
/ɐstɹənˈɒmɪkəl jˈuːnɪt/
/ɐstɹənˈɑːmɪkəl jˈuːnɪt/
AUAstronomical unit
01
a unit of measurement equal to the average distance between the Earth and the Sun, approximately 149.6 million kilometers
Example
Earth's orbit spans about one AU.
Neptune is approximately 30 AU away.
Astronomers use AUs for interplanetary measurements.
