I dont know if you guys are fimiliar with this expiriment so I'll describe it first. Lets say that theres a plank(1km and at rest with respect to the plank) away, and I launch a bullet at the plank and 1,000km/sec, and exactly one second later, the bullet hits the plank. Now, the depth at which the bullet travels into the plank, is going to depend on its momentum. Now lets say that there is a space craft moving perpindicular to the bullets trajectory at very high speed(gamma factor of 10). The expiriment states, that the observer in the space craft is going to view the bullet taking 10sec to hit the plank instead of 1sec as observed by the stationary(with respect to the plank) observer because of time dialation(which I understand). Now here are my questions. 1.) If your going 1,000km/sec, wouldn't it take alot less then 1sec to travel 1km. 2.) i thought that you can only experience time dialation and space concraction in parellel reference frames. thanks in advance Keep in mind, i only started learning relativity 4-5weeks ago and I'm only a high school senior.