Winterlong Posted August 9, 2020 Author Share Posted August 9, 2020 2 hours ago, studiot said: So you have read my comments, even though you did not respond to them. Apologies 2 hours ago, studiot said: If (as i am inclined towards) the universe is infinite of course he never sees the reference point return and the maths has a division by zero error. Right, but for this mental experiment we'll assume that the universe is finite in space. That could be right or wrong, but it is not prohibited in relativity 2 hours ago, studiot said: The pilot sees the rest of the universe (the reference starting point) receeding away from him to the left at this incredible speed. If the manifold is finite but closed he then sees the reference point approaching at incredible speed from the right a very short time later. If (as i am inclined towards) the universe is infinite of course he never sees the reference point return and the maths has a division by zero error. So as far as the pilot and his spaceship are concerned the rest of the universe is smaller than his ship and makes a circuit around it. So what ? Where is the paradox ? I don't understand this. We apply Lorentz-contraction and, for whatever length is considered, it is just a matter of to speed up close enough to c to contract it to 1 m. I imagine this contraction in the direction of the movement, like two walls closing on the ship from the front and rear. Why is it receding to the left? Link to comment Share on other sites More sharing options...
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