Submitted by GMEplits2 t3_y1h3y2 in askscience
Jupiter has lots of moons, one of them is called Callirrhoe, it's less than 10 m wide and it has a crater on it from I'm assuming an impact of some kind. That's how craters form as far as I know, so if NASA can alter the trajectory of a much larger body with a much smaller impact, why didn't this crater cause this Moon to leave Jupiter's orbit? What's keeping the Earth from sliding out of orbit around the sun the more often we launch spacecraft from it? Isn't every tiny force against the earth moving it out of its orbit? Because of the relationship of objects in a gravity well aren't we moving the Sun and potentially destabilizing that too, however an insignificant amount? Could many years of spaceships launching from the same place on Earth at the same time of year/day/force angle cause it to lose its stable orbit? Eventually?
I'm aware these are irrational fears I would just like someone very smart to tell me why LMAO