Question about Cavorite
So this substance screens out gravity. That would mean that if you want to go to the moon, a sphere like the one they built could use Cavorite to prevent the Earth's gravitational pull from keeping it on the Earth.
In order to reach the moon, though, wouldn't you still need a source of propulsion to push the sphere in the right direction?
I do understand the idea of how they could open and close Cavorite screens on the sphere's surface to avoid Earth's gravity and use the moon's gravity to attract the sphere. But in the movie it looks like the sphere takes right off quickly and starts shooting towards the moon. Given the distance between the sphere, sitting on the surface of the Earth, and the moon, and the mass of the sphere and the moon, I don't think the Moon's gravity would make the sphere move that fast even if the Cavorite "cut off" the effect of Earth's gravity on the sphere. It is more likely the sphere would just gently float around, perhaps pushed by forces other than gravity like air currents.
That's what I think, anyway.
Of course, I'm no physicist - to be honest, I struggled a bit with some physics topics in school(then again, that's not too uncommon, it's a challenging subject!) so maybe there's some simple explanation I missed.
Thoughts, anyone?