a) if Jim is on a space ship traveling from earth, and the ship takes a 2 year journey at a speed of 99.9999c (99.9999% of the speed of light) when the space ship returns how long has Jim's friends think he has been gone? I b) If the spaceship is 100m long when it is observed by someone on earth how long does it appear to be?

a) if Jim is on a space ship traveling from earth, and the ship takes a 2 year journey at a speed of 99.9999c (99.9999% of the speed of light) when the space ship returns how long has Jim's friends think he has been gone? I b) If the spaceship is 100m long when it is observed by someone on earth how long does it appear to be?