For 10 points, name these celestial objects, examples of which include Shoemaker-Levy 9 and Hale-Bopp.
Heinrich Kreutz is the namesake of a family of these objects, and Fred Whipple devised a model of them. One of these objects was studied by the Deep Impact mission, and another was studied by the Giotto mission. One of these objects collided with Jupiter in 1994, and another named Swift-Tuttle is responsible for the Perseid meteor shower. The long-period type of these objects comes from the Oort cloud, and the short-period type comes from the Kuiper belt. For 10 points, name these celestial objects, examples of which include Shoemaker-Levy 9 and Hale-Bopp.
Heinrich Kreutz is the namesake of a family of these objects, and Fred Whipple devised a model of them.
comets