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Asteroids

The asteroids form a `belt' which orbits the Sun between
Mars and Jupiter
They are large rocks left over when the Solar System was
formed

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They are not able to come together to form planets because
the gravity of Jupiter holds them in place

There is evidence that asteroids have hit Earth in the past:

Impact craters in Earth
In sedimentary rocks, one layer of rocks found over the
entire surface of the Earth, contains…

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A comet is made of dust and ice, just like a dirty snowball
As a comet passes near to the Sun, the ice melts
A glowing cloud if gas and dust forms around the comets
Solar wind from the Sun blows the gas and dust into the
comets talk
This…

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