Health,
I think you’re a bit confused on this. A light-year is a measure of distance — nothing more. It is the amount of distance that light can travel in one year (hence the name). It is equal to 4.5 trillion miles (approximately).
Also, the mass would be infitismly small.
Actually, the opposite is true. Objects *gain* mass as they approach c. I used to joke that if I excersized (by running) I would actually gain weight (because I was a bit closer to c.*
4) A cracked whip’s tip (not the entire object, but a portion of it).
Yep — that’s the answer I was looking for.
The Wolf
* Yes, it’s a joke. Obviously I can’t run that fast for it to make a bit of difference.