1000 kilometers = 6.68458134 × 10-6 Astronomical Units.
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1 km = 1000 meters 1 meter = 0.001 km
1000 m in a KM Kilo means 1000 so kilometer is 1000 meters :)
1000 m = 1 km. So 850m/1000 = 0.85 km
1 km = 1000 m ⇒ 5.1 km = 5.1 x 1000 m = 5100 m
1 km = 1000 m so 0.001 km = 1 m