Steve C wrote:And fourth is bit more science-y and forgivable that it was ignored. The Earth-Moon is a gravitational pair going around the Sun. If the Moon flew off then the mass of the pair going around the Sun would change and the corresponding orbit would change. Odds are it wouldn't be stable. The mass of the Moon is only 1/81th that of the Earth but even a small change to a stable system has the potential to upset it completely. Check out this video of what happens when a rogue star comes near to our solar system. Note that the star doesn't need to hit anything to completely destroy the solar system- it's not even in it before planets start flying off. If a small rogue planet the size of Mercury came near our solar system it would change the orbits of planets and some would get thrown out. I don't thinkthis program can simulate the removal of a moon but I'm sure there are similar programs out there. I'd bet money that if the Moon was removed like in this episode the orbits of the inner solar system would change. Maybe a little bit, maybe a lot. Either way it would be really bad and destroy the habitability of Earth. I remember messing with that program and throwing a rogue Pluto sized object through the solar system. It didn't come close to hitting anything and still the solar system was drastically altered. For example Earth's orbit became far more elliptical crossing Venus' and Saturn's orbits. Bye bye life.
tl'dr- Worst episode evar!
A rogue star is a lot heavier than the Moon. So it's unlikely that a planet with a mass 7% of that of the Earth (that is the necessary mass of Moon for there to be 1g of gravity at it's surface, if the Moon radius remains unchanged) would influence the inner system much. It would certainly cause changes in the Earth's orbit. The barycentric center would move to a place 20 000 km above Earth surface. I'm afraid Moon and Earth would go into highly eccentric orbits around each other due to them not having enough speed to maintain their old orbits around a much lighter body. But this has supposedly been happening for 10 years. I guess Earth's orbit around the Sun will be affected (Especially since the dragon would be tugging on the Earth when he left our orbit) but not by much.
But than again we are arguing science over something that has magically mass increasing Moon.