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The main difference in btwn asteroids and commets is their composition as in what they are made of asteroids are made up of rocky material while comets are made up of ice, dust.. Hope i helped u :)
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Comets are made up of sand, water ice,  carbon dioxide,etc and are also called big, dirty snowballs.they orbit the sun and when they make nearest close to sun, solar heating vaporize ice and gases, which form a tail.they mainly come from oort clouds or kuiper belt.
asteroids are made up of rocky and heavier elements like platinum, gold, silver,etc.they are mainly found in asteroid belt between mars and jupiter. they come in all sizes from a size of pea to a house.  
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