With regard to the Unstoppable force/immovable object questionL
1. There is no such thing as an unstoppable force. Anything moving requires energy. As it moves, energy transforms & dissipates through heat, light, sound, friction etc. This is why perpetual motion machines never work. Even huge forces travelling through vacuums would eventually slow down after a while.
2. There is no such thing as an immovable object. Everything in the universe moves, from islands, to planets, to stars, quasars, black holes etc. Even the universe itself is expanding exponentially, so even if the universe did have an 'edge', that is also moving.
3. IF an unstoppable force were to meet an immovable object, the force would either not collide with the object and pass through unimpeded, or would be deflected.
4. The classic answer, which is also wrong due to points 1, 2 and 3, is that the unstoppable force would stop, and the immovable object would move. (kind of rendering the unstoppable/immovable aspects of the question irrelevant)
