Nowadays, all people in the world believe that the Earth goes around the sun system. It is natural to think so, because it's based on logical theory. But long years ago, lots of people believed that the sun went around our Earth. I think our ancestor was enough clever to discover the new theory.
In the future, technology must be advanced. Perhaps, some people could be living in the moon. I'm looking forward to being able to visit moon.
Arnold, Eric. (2004). Race into space. Step into reading.
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