dravidanyuszi

If a man sets out from the Horsehead Nebula in a spaceship travelling at thrice the speed of light, and his father leaves from Rigel Two at the same time going half the speed, how many nanoseconds will it be before time paradox causes the first man never to have been born?

A válaszokat a 0690-111222 számra várjuk, a nyeremény egy közös vacsora Dr. Sheldon Cooperrel.