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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 lots of iridium; this is a
metal element rare on Earth ad may have come from the
impact object
Unexpected elements in the rocks
Asteroids would have caused fires on Earth and the layer of…read more

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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 always points away from the Sun, so a comet travels
tail first as it goes away from the Sun
The tail may be hundreds of millions of kilometres in
length!
Collisions
If an asteroid or…read more

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