A "great comet" refers to a type of comet that is exceptionally bright and visible to the naked eye, often appearing prominently in the night sky. These comets typically have large nuclei and long tails, and they can be observed for extended periods of time, sometimes several weeks to months. Great comets usually become noticeable from Earth when they approach the Sun and undergo significant changes due to the heat, which causes the comet's ices to sublimate and produce a glowing coma and tail.
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