Here's a little bit more about the moon. You correctly pointed out that the moon might not have always been in orbit of our planet, Jovaro.
The author writes this: When the moon was much closer in the past [...]
An orbit is in fact a way of falling towards a planet/star/big piece of matter. Our moon is slowly falling towards Earth, but because of its movement, he keeps falling around the side. (The moon is like the piece of lettuce that keeps going round and round in your sink, when you pull the plug.)
Eventually, the moon would crash on Earth. Every planet in our solarsystem is in fact falling towards the sun. If there is one movement the moon is making, then it is TOWARDS the Earth. It would be unlikely that the Earth was CLOSER to Earth in the past.