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attoparsec: n. About an inch. atto- is the standard
SI prefix for multiplication by
10-18. A
parsec (parallax-second) is 3.26 light-years; an attoparsec is thus
3.26 ×
10-18 light years, or about 3.1
cm (thus, 1 attoparsec/microfortnight equals about 1
inch/sec). This unit is reported to be in use (though probably not very
seriously) among hackers in the U.K. See
micro-.
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