And instead of (metric) tons, I want megagrams. No kilotons; gigagrams.
I remember the first time I got those units out of gnu units on the command line scratching my head wondering why I'd never used them before and why it was using them at the same time.
atto-lightyear = 1e-18 lightyear
lightyear = 3.156e+7 lightsecond
Hence, atto-lightyear = 3.156e-11 lightsecond = 31.56 pico-lightsecond