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2021-03-26, 07:09 PM (ISO 8601)
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- Feb 2016
How are times after time dilation resolved in relativity
It's my understanding that under relativity if two objects are moving relative to each other at an appreciable fraction of the speed of light they will both perceive time to be slowed down for the other. How does this work out if they meet up?
For example, if I make a round trip to a star five lightyears away from earth at 99.5 percent the speed of light, the earth will percieve it as taking ten years and time on my ship advancing at 1 tenth the rate (and also the ship all smooshed up). But equivalently I will experience the earth ans stars shifting a 0.5 lightyear distance (due to length contraction) and back and still see the earth's time moving at one tenth of my own.
Why doesn't this lead to an infinite regression?"If you want to understand biology don't think about vibrant throbbing gels and oozes, think about information technology" -Richard Dawkins
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2021-03-26, 07:30 PM (ISO 8601)
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- Jul 2010
Re: How are times after time dilation resolved in relativity
You haven't yet taken into account the effect that turning around at the destination has on the reference frames.
Look up the "twin paradox." There are some pretty good explanations on YouTube. I'm not sure which one I remember had a particularly good explanation, but I can't look it up right now.
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2021-03-26, 08:09 PM (ISO 8601)
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- Feb 2016
Re: How are times after time dilation resolved in relativity
each time you stopped (at the middle and at the end) time on the planet would rush forward four and a half years?
"If you want to understand biology don't think about vibrant throbbing gels and oozes, think about information technology" -Richard Dawkins
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2021-03-27, 12:18 AM (ISO 8601)
- Join Date
- Jul 2017
Re: How are times after time dilation resolved in relativity
If you assume instantaneous turning around (although this is minor in the overall scheme of things) and instantaneous transfer of information (this very much is not). Relativity breaks all over the place if you assume any instant transfer of information.
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2021-03-27, 01:05 PM (ISO 8601)
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- Jul 2008
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Re: How are times after time dilation resolved in relativity
It's resolved with acceleration. Acceleration causes time to slow down, right now you're accelerating up against the gravity of the Earth. That acceleration does in fact cause time to move slower for you than if you were deep in intergalactic space.
It's too complicated for my tiny inferior brain to *understand, but here's a link https://en.wikipedia.org/wiki/Accele...al_relativity)
*Not really, I'm just too lazy at the moment
The one on the space ship will have experienced less time than the one on Earth because the space ship had to do a LOT of acceleration to reach 99.5% of the speed of light. That acceleration, then de-acceleration (still counts!) and then accelerating back and finally de-accelerating on arrival would resolve the paradox.Black text is for sarcasm, also sincerity. You'll just have to read between the lines and infer from context like an animal
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2021-03-28, 02:47 AM (ISO 8601)
- Join Date
- Jul 2010
Re: How are times after time dilation resolved in relativity
I think this is the video I was thinking about earlier:
https://m.youtube.com/watch?v=6MfJ59lkABY
On further reflection, there are details I don't like, but the spacetime diagrams are decent for helping understand some aspects of this topic.
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2021-03-28, 02:55 PM (ISO 8601)
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- Sep 2016
Re: How are times after time dilation resolved in relativity
Very carefully, taking note as to exactly which inertial frame you are measuring in.
(and as noted in the twin paradox that involves 3 frames)
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2021-03-28, 05:26 PM (ISO 8601)
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- Jan 2007
Re: How are times after time dilation resolved in relativity
In a war it doesn't matter who's right, only who's left.