Which of the following best encapsulates the definition of a comet?

A comet is best described as a celestial body with ice and dust, which captures its essential characteristics. Comets are composed primarily of frozen gas, ice, dust, and rocky materials. When they approach the Sun, the heat causes the ice to vaporize, creating a glowing coma and often a tail that can extend millions of kilometers. This behavior distinguishes them from other celestial objects.

In contrast, large rocks in space are more accurately defined as asteroids or meteoroids, which do not exhibit the same icy characteristics or develop tails. A stationary star does not fit the description of a comet, as stars are massive celestial bodies that generate energy through nuclear fusion and are not composed of the same materials as comets. Lastly, a satellite of the Earth refers specifically to the Moon or artificial satellites orbiting our planet and bears no resemblance to the composition and behavior of a comet. Thus, the definition highlighting the icy and dusty components of comets is the most accurate.