When do moving objects stop?

I have several moving objects on a scene. When do they stop? When the character during gameplay go several time through the same scene, does the objects begin at the starting point again?

Thanks for your help guys ;-)

Fredi

 

I mean moving objects, that move outside the scene...

 

this is the threshold in which everything "stops" cuz it dies... that is in pixels... and this is found in the world options