Hello, this is my first post on the forums and I would like to say this site is very interesting - I have read many physics books and am very interested in the subject. I suppose due to my poor reading comprehension or just general misunderstanding of the subject, I have a question about relatavistic phsycis and Newtons Classical methods: I understand that planets gravitate towards eachother; gravity is "the tendency of objects with mass to accelerate toward each other", G=m1m2/D^2. This is in accordance with newtons law. Then, in Einstein's theory of relativity, this is wrong. There is no actual "force" between the two objects. Gravitation arises out of spacetime being curved by the presence of mass. Therefore; Newtons law is wrong. Yet, in the definition of gravitation it cites: "The gravitational attraction of the earth endows objects with weight and causes them to fall to the ground when dropped..". Maybe im uncomfortable with the word "dropped" and "fall" after all of this. I will try and describe a few situations I have envisioned: If two tennis balls were out in deep space, and slowly "gravitating" towards eachother, what would really be happening is that they are both bending space-time, and actually traveling straight in their own reference frame. Correct? If that is correct, then if someone throws a tennis ball on earth, the same thing is happening again? The earth is bending the space-time and the ball is not really "dropping", but more moving straight in its own reference frame as the earth bends the space-time so the ball appears to fall/curve to the ground; but it really isnt falling. I believe I am really hitting that mental block of jumping from common-sense Classical Mechanics into Relativity. I am fairly well read when it comes to Relativity; but I have had no formal learning and not many diagrams to aid me (im pretty visual). Can anyone help me out or clear things up for me? Sorry for the long post. I actually feel better about how I feel now that I have typed out some thoughts. Thanks.