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Answer:
1.The main difference between asteroids and comets is their composition, as in, what they are made of. Asteroids are made up of metals and rocky material, while comets are made up of ice, dust and rocky material. Both asteroids and comets were formed early in the history of the solar system about 4.5 billion years ago.
2.Asteroids and comets help astronomers trace solar system evolution. NASA said: Most of the material that formed our solar system, including Earth, didn't live to tell the tale. It fell into the sun or was ejected beyond the reaches of our most powerful telescopes; only a small fraction formed the planets.
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