Prefix names have been mostly chosen from Greek words (positive powers of 10) or Latin words (negative powers of 10), although recent extensions of the range of powers of 10 has resulted in the use of words from other languages. For example, where does ‘kilo’ come from? To many people, the choice of prefix names seems strange. Using the prefix for 10 9 from the table above, this becomes 78 Gm, which is pronounced as ‘seventy-eight gigametres’. The distance from the Earth to Mars is 78 million kilometres, which is 78 x 10 6 km, and this in turn is 78 x 10 9 m. The ‘km’ means kilometre, which is 10 3 m. For example, in the article Distances in space, it states: When the Space Shuttle goes into space, it orbits about 700 km above the surface of the Earth. The Space revealed resources deal with extremely large distances. In abbreviated form, this length is written as 1 nm.
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