3.They use a distance called the parsec (a contraction of parallax and second), based on a universal measure called the stellar parallax and equivalent to 3.26 light-years.
4.Your ship's faster-than-light jump drive consumes 1 unit of fuel for every parsec of distance it takes you, and your ship holds only 15 units of fuel.
5.You scoff, remembering that a parsec is a unit of distance, not time, when suddenly your ship powers down and a boarding party is beating down the outside hatch.