Well, it is not quite that simple. Just as the
sun was being born, it sat in the middle of a
pancake disk of gas and dust particles. These dust
particles were constantly colliding and forming
bigger and bigger objects. Eventually after 10 to
30 million years this process of collision and
amalgamation created the PROTOPLANETS.
These bodies kept colliding, and finally after
about 70 million years formed the planets pretty
much as we see them today. This process is
called COLLISIONAL ACCRETION. Without it, we
would not be here!
What a big question! The earth is around 4
billion years old (4 000 000 000), and for
most of it's life there were no plants, animals or
humans! That is because when the earth first
formed, it didn't look at all like it does today.
There were no continents like there are today, it
was extremely hot and our atmosphere was mostly
Carbon Dioxide back then, instead of oxygen! It
took a few billion years before the atmosphere had
more oxygen, and then different organisms started
to form. Over thousands of years organisms
developed until there were the plants and animals
we see today.
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