1) In special relativity, the proper
length of an object moving
at velocity close
to that of the speed of light is its length as measured by an observer in the rest frame of the object.
2) A massive shit.
1) Will: Dude, that 30cm ruler travelling
at the speed of light looks to be only
Nathaniel: Yeah, that's because it's proper
lenth is 30cm.
2) Nathaniel: Dude, I just crimped out a proper
Will: Yeah, thats a proper