Comets - Comets Comets are small "potato-shaped"...

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Comets Comets are small "potato-shaped" objects a few hundred meters to about 20 kilometers across. They are made of dust grains embedded in frozen volatiles like water, methane, ammonia, and carbon dioxide (they are like "dirty icebergs" ). They are primitive objects which means they are unchanged since they first solidified from the solar nebula about 4.6 billion years ago. Comets are frozen relics of the early solar system holding valuable information about the formation of the planets. When a comet gets close enough to the Sun, it changes into something more spectacular. The picture above shows the parts of a comet that form when the cold "dirty iceberg" is warmed up by the Sun. This picture is courtesy of David Doody at JPL and is part of the Basics of Space All the material comes from the nucleus . This is the "dirty iceberg" . Comet nuclei are 0.5 to 20 kilometers in size and are potato-shaped conglomerate of dust (silicates and carbonaceous) embedded in ice (frozen water, carbon dioxide, carbon monoxide, methane, and ammonia). They
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Comets - Comets Comets are small "potato-shaped"...

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