prefixes
  • Units used in astronomy and in science generally are often modified with prefixes, usually running in three powers of ten. The most important are kilo, mega, giga and tera for a factor of a thousand, a million, a billion and a trillion (a trillion is a thousand billion) and milli, micro, nano and pico for a factor of a thousandth, a millionth, a billionth and a trillionth.

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