Some useful distances. Please note that from Sydney to Perth is about 4.1 megametres.
A yottametre (Ym) is a septillion metres
A zettametre Zm) is a sextillion metres
A exametre (Em) is a quintillion metres
A petametre (Pm) is a quadrillion metres
A terametre (Tm) is a trillion metres
A gigametre (Gm) is a billion metres
A megametre (Mm) is a million metres
A kilometre (km) is a thousand metres
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