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1. B. periodic comet

2. Comets were named by the Greek philosopher Aristotle, who thought comets were “stars with hair”. The word “comet” comes from a Greek word meaning “hair of the head”.

3. 1986

4. 2061

5. A comet is a fairly small object that orbits the sun and is made up of ice, dust, and small rocky particles. When they get close enough to the Sun, the water, carbon dioxide, and other compounds on their surface quickly change from solids to gases, forming a fuzzy outline called a coma. Sometimes they also have a tail.