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You
can search for and then find all the words relating to
comets.
A
comet is a chunk of material left over from the formation of
the solar system. About 4.6 billion years ago, our solar
system formed from a vast cloud of gas and dust. Slowly
pulled in by its own gravity, this swirling, roiling mass
collapsed, and if you could have watched, it might have
looked like an explosion in slow motion and reverse. Most of
the material in the cloud collected at the center and formed
the Sun. Other big clumps of gas and dust became the
planets, including Earth. Some of the material that didn't
get caught up in the Sun or planets as they were forming
gathered into smaller chunks, sometimes just a few
kilometers across. Many of these chunks are what we call
comets.
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