- #1
Joe30174
- 9
- 2
Tldr: relative to what are we traveling through spacetime at the speed of light. It must be relative to something not moving through space nor time, which doesn't exist. (And possibly light, not sure though because light doesn't experience traveling through time)
I understand we are talking about spacetime and not space. So if we were talking about an object at rest, it travels through time at the speed of light. If the object were to move, it would still travel through spacetime as a whole at the speed of light because the greater the magnitude of the velocity would lessen the speed of time it is traveling at. I understand viewing it on a spacetime diagram. But it still doesn't make sense.
What is this speed relative to? If an object is at rest relative to the examining object, they both equally travel through space and time together, meaning it is not traveling through space time at all, let alone the speed of light. If the relative object is moving in a direction, it is the combination of its displacement and time, which they are still both traveling through time.
If you were to draw numerous objects and their displacements on a 2d spacetime graph, relative to each other they arent traveling at the speed of light. Only relative to (0,0) if that's your starting point, or wherever you want to put that starting point. So your frame of referance is something that is not travelimg through time nor space. And there's nothing in the universe that exists that we know of.
On a 2d graph for, let's say north, south, east, and west, the frame of reference could be the earth. And that can make complete sense because relative to the earth, it is stationary and not moving in those directions. But adding time in there, the Earth is traveling through time at the same speed, or very slightly slower than a mobing object on earth. Me laying here on my bed, i didnt travel through time at the speed of light faster than the earth.
Or can (0,0), or the object that is not traveling through spacetime, be the universe as a whole. Which would mean it is possible to have an unbiased frame of referance to calculate everything else. Wether humans could ever do it or not, idk.
I understand we are talking about spacetime and not space. So if we were talking about an object at rest, it travels through time at the speed of light. If the object were to move, it would still travel through spacetime as a whole at the speed of light because the greater the magnitude of the velocity would lessen the speed of time it is traveling at. I understand viewing it on a spacetime diagram. But it still doesn't make sense.
What is this speed relative to? If an object is at rest relative to the examining object, they both equally travel through space and time together, meaning it is not traveling through space time at all, let alone the speed of light. If the relative object is moving in a direction, it is the combination of its displacement and time, which they are still both traveling through time.
If you were to draw numerous objects and their displacements on a 2d spacetime graph, relative to each other they arent traveling at the speed of light. Only relative to (0,0) if that's your starting point, or wherever you want to put that starting point. So your frame of referance is something that is not travelimg through time nor space. And there's nothing in the universe that exists that we know of.
On a 2d graph for, let's say north, south, east, and west, the frame of reference could be the earth. And that can make complete sense because relative to the earth, it is stationary and not moving in those directions. But adding time in there, the Earth is traveling through time at the same speed, or very slightly slower than a mobing object on earth. Me laying here on my bed, i didnt travel through time at the speed of light faster than the earth.
Or can (0,0), or the object that is not traveling through spacetime, be the universe as a whole. Which would mean it is possible to have an unbiased frame of referance to calculate everything else. Wether humans could ever do it or not, idk.