This is a statement from my textbook "When an object falls down, it falls inwards towards the centre of mass of the Earth pulled by it's gravity. As said in Newton's 3rd law of motion the falling object will also exert an equal and opposite force on Earth; which then accelerates upwards towards the object." What the heck does that mean? If a satellite falls down on earth and the gravity on it is 9.8 then is it also exerting a force of 9.8 on earth? How is that possible? Can somebody please please clear this up for me?