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The primary core of a comet is known as the "Nucleus." The nucleus of a comet is a solid, icy body that is made up of water, gases, dust, and other volatile compounds. It is typically composed of a mixture of frozen water, methane, ammonia, and carbon dioxide, among other substances.
When a comet gets closer to the Sun, the heat causes the volatile compounds within the nucleus to sublimate, creating a glowing coma (the fuzzy envelope around the nucleus), which can be expansive. This process also results in the formation of a dust tail and sometimes a plasma tail that point away from the Sun due to solar wind and radiation pressure.
In summary, among the options given, the correct term that describes the primary core of a comet is the "Nucleus." It serves as the central, solid part of a comet from which the coma and tails originate during its journey through the solar system.
