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Petameter or petametre is equal to 1015 meters (unit of length), comes from a combination of the metric prefix peta (P) and the SI unit of length meter (m). Plural name is petameters.
Kilometer or kilometre is one of the most common metric units of length or distance. It is equal to 1 000 meters. It is about 0.62137119 mile, 1093.6133 yards, or 3280.8399 feet. Plural name is kilometers.