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Measuring Distances in the Solar System. Instead of using km or miles, the astronomical unit is used to measure distances in the solar system. Sun to Earth = 93,000,000 miles = 1 astronomical unit = 1 au. Sun to Mars = 1.52 au. Sun to Mercury = 0.39 au.
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Measuring Distances in the Solar System • Instead of using km or miles, the astronomical unit is used to measure distances in the solar system.
Sun to Earth = 93,000,000 miles = 1 astronomical unit = 1 au Sun to Mars = 1.52 au Sun to Mercury = 0.39 au