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You may be wondering why Pluto does not collide with Neptune, since their orbits are close. This is because their orbits are in resonance. Pluto orbits the Sun twice for every 3 orbits of Neptune.7art Space screensaver brings you 22 pictures with incredible cosmic views. The 7art Space screensaver will teleport you into a deep space to vanish away in grandiose star scenery.This screensaver contains 32 photos of different objects in the Universe made mainly by Hubble telescope. You can see the formation of new stars and relict light of ancient stars, "blackholes" and "supernova" stars located far far away from us. With this program, one can draw images to see the effect of gravitational lensing. You can easily test the effects of several parameters by changing them and redrawing the image.