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How do comets help explain the formation of the planets?a. Comets are understood to be planetesimals from the outer Solar System. Thus, the composition of ices and dust in the nuclei is the same as that of the original outer solar nebula.b. Comets are understood to be planetesimals from the inner Solar System. Thus, the composition of rock and metal in their nuclei is the same as that of the original inner solar nebula.c. Comets are understood to be fragments of ancient planets. Thus, the composition of rock and metal in their nuclei is the same as that of the first planetesimals.d. Comets are relatively young objects; they cannot survive more than about half a million years. Therefore, comets cannot tell anything about the formation of the planets.
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