Space Junk brings much needed focus to the problem about junk in earth's orbit and the effects it might have on space travel and even communication here on earth. It's a short educational documentary, that seems more suited for a 30 minute slot on the Discovery Channel or PBS, than on an IMAX screen. There is too much reliance on digital effects here and quite frankly, they're terrible. Space Junk feels designed to be a visual experience, as much as it wants to be an educational one, but the bargain basement CG never lets this rise to anything but a quick lesson about dead satellites and how the space in earth's orbit is smaller than you think.