# Thread: can anybody solve my problem on space-time

1. scene 1: you are on one side of the earth. since the earth is sinking into time-space, the logical thing for the ball to do is go down just 1 direction. but on the other side of the earth. the ball goes the other way. could we be in a parallel universe because we are seeing two realities. please awnser. thx

2.

3. Ball? What ball?

I think you are seeing things there are not, maybe you should find your answer in psychology.

4. sorry, i didnt make it clear. say you had a golf ball and you threw it up. it will come back down. but on the other side of the earth. when you throw the ball. it goes the other way. its the earths gravity. but time-space makes gravity. if you could watch a youtube video on space-time you will see how it works

6. What video did you watch?

7. Are you thinking of the "rubber sheet" analogy for the way masses curve spacetime? If so, you have to remember that that is a very simple description of what is happening in one-dimension.

You need to try and visualise spacetime being curved towards the Earth from every direction. Not easy to imagine is it? Which is why they use the simplified version.

Another model that might help visualise what is happening is to think of space being sucked in towards the Earth dragging things with it. (Agaian just an analogy but maybe easier to imagine. The important thing is that the Earth is a sphere and so whatever happens is symmetrical all around it.)

8. thx strange

9. The ball will follow geodesics in space time that correspond to tidal flow.<BR><BR>Imagine a sphere of fluid / gas in interstellar space. As it approaches a massive body the fluid sphere will progressively distort to an elliptical shape<BR>but retain the SAME volume. Consider this fluid now surrounds the entire massive body - wht we get now is a volume REDUCING tendancy and this is what we feel as the force of gravity. <BR><BR>The ball in your example always falls in the same direction - towards the centre of mass