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  1. The nucleus is the solid, central part of a comet, once termed a dirty snowball or an icy dirtball.A cometary nucleus is composed of rock, dust, and frozen gases.When heated by the Sun, the gases sublimate and produce an atmosphere surrounding the nucleus known as the coma.

  2. An interstellar object is an astronomical object (such as an asteroid, a comet, or a rogue planet, but not a star) in interstellar space that is not gravitationally bound to a star. This term can also be applied to an object that is on an interstellar trajectory but is temporarily passing close to a star, such as certain asteroids and comets ...

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