I have used AndEngine for a simple game that did not require the use of physics, so I am not very familiar with Box2D extension.
My question is if Box2D could be used to simulate objects that have their own gravitational field and can influence other (smaller) objects (which would orbit around them, get deflected / sling shot, or crash into to the surface). This would be similar to the interactions between planets, moons and asteroids in space.
As an example see Angry Birds Space, where the birds get caught in the gravitation field of the planet, orbit around within the atmosphere and then descend to the surface, in their attempt to hit the target.
Do you think something similar could be possible with Box2D?