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Scientists say the universe was formed because of a 'Big Bang'.
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15 billion years ago there was a small super hot, super dense, ball of fire.
The ball was less than 1cm wide. Suddenly, the ball exploded.
In less then a millionth of a second, it grew to a huge ball, 16 billion km across.
In the next million years, the exploded pieces became colder and formed galaxies.
The Earth, Moon and Sun belong to a galaxy called the Milky Way.
They were born less than 5 billion years ago.
There are 200 billion stars in our galaxy.
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