The truth is that no-one really knows how the universe was made. It’s a really tricky question to answer!! There are lots of different theories like the big bang theory and string theory etc, but no-one knows for sure if they are right!
The earth is believed to have formed from lots of asteroids colliding together until they made a planet sized object that we now call Earth. Again though, scientists can only speculate what actually happened and there are lots of different theories!
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