The megametre (Mm) is a unit of length in the International System of Units, defined as 106 metres using the SI prefix system.
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Megametre is rarely used. It could be used to specify long distances around the world as well as specifying the sizes of the worlds. For example the distance from London to New York is approximately 5.6 Megametres, and from Tokyo to Los Angeles is approximately 8.8 Megametres. Russia, The widest country, spans about 9 Megametres while the perimeter of Russia is about 20 Megametres. The diameter of Earth is roughly 13 Megametres while the circumference of Earth is about 40 Megametres. The Moon has a diameter of nearly 3 Megametres while Jupiter, the biggest planet in our solar system, has a diameter of 139.822 megametres.