 Re: Does everything move?
It's all a matter of where you set your frame of reference. In a universe where nothing is constant, save for the speed of light, a mass is only, by definition, not moving if it is remaining at a constant position with your reference point. If I have a reference point here on Earth then the sun is moving with respect to that point. If my reference is on the sun then the Earth is moving with respect to that point. Let's take for instance a baseball been thrown from a pitcher's mound to home plate. Let's say that the stadium is in a cartesian coordinate system. If our origin is home plate, then the only thing moving is the ball. If the reference point is the ball, then everything is moving. Einstein's theory of relativity sums this subject up pretty good. In the end the only thing you can count without doubt is the the speed of light. 1 ft/nanosecond |