Usa destinations for A great comet commands the attention of all humans. The Celestial Jokers Comets are the celestial jokers, mavericks that simply do not follow the normal rules of the heavens. They appear in the sky out of nowhere. They may venture into celestial territory where no planet can ever go, even into the polar regions. Whereas the stars and planets followed set schedules that the ancients were able to identify and on that basis determine seasons and make predictions, comets appeared to be completely random in their movements. Sometimes a comet remains in one spot or region of the sky for weeks or indeed for its whole apparition; at other times a comet races very quickly across large sections of the heavens. Comets may suddenly change their apparent direction and behavior. Usa destinations 2016.