At light speed, Einstein's equations break down and nothing makes sense

submitted by hfxB0oyA from bigthink.com

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[–]Vulptex 4 insightful - 3 fun4 insightful - 2 fun5 insightful - 3 fun -  (3 children)

Einstein's physics theories predict time dilation, which is pretty much what you described. Not time travel as we think of it, and certainly not into the past. That would only be possible with a wormhole.

Time dilation has been proven, both with experiments on earth and by observing massive objects such as black holes.

[–]ActuallyNot 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (2 children)

Time dilation has been proven, both with experiments on earth and by observing massive objects such as black holes.

Yep.

You have to use it for GPS. The time measurement has to be so precise, that if you don't account for relativistic time dilation from the GPS satellite being in a weaker gravitational field, you get your position wrong.

And without it, you can't explain the advance of Mercury's orbit.

[–]zyxzevn 2 insightful - 2 fun2 insightful - 1 fun3 insightful - 2 fun -  (1 child)

The GPS and Mercury orbit is related to Einstein's gravity. A different Einstein theory: General relativity.
Which he derived from Special relativity, which deals with the speed of light and time.

The first gravity theory of Einstein was about a variable speed of light.
You can get the same GPS and Mercury orbit with it.
And according to RonHatch it is even better, but we never see it discussed.

[–]ActuallyNot 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

Which he derived from Special relativity, which deals with the speed of light and time.

Not quite true. The derivation was independent from special rel.

The first gravity theory of Einstein was about a variable speed of light.

Really?

Contradicting Maxwell's equations?

When was his work on this theory published?