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Re: What is Twistor Theory? | Roger Penrose AND What came before Big Bang? Why he changed his mind. 

By: Zimbler0 in GRITZ | Recommend this post (1)
Tue, 10 Jun 25 5:25 AM | 13 view(s)
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Msg. 09481 of 09656
(This msg. is a reply to 09472 by De_Composed)

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Decomposed > Velocity affects time (it slows it.) And a gravity well affects time (by bending space-time.) But merely being IN a gravity well? I think time would move at the same rate for those who are in the well as for those who are outside of it.


I dunno De.
This article has an interesting story about 'Time Dilation' and GPS positioning satellites. The time dilations are very very small . . . but apparently measurable.

>>>
HOW RELATIVISTIC TIME DILATION AND GPS ARE RELATED

http://www.scienceofgadgets.com/post/how-relativistic-time-dilation-and-gps-are-related

Einstein's theory of relativity is one of the most significant achievements in the history of science. All the more so as it has been developed by only one person. Many of the conclusions drawn from this theory are literally striking and seem completely unbelievable at first glance. One of the conclusions of the theory of relativity is that time itself is by no means absolute.
>>>

(Article does continue. Zim.)

But I was thinking that someone had used satellites to actually measure gravitational time dilation.

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Einstein's 'Time Dilation' Gets Pinpoint Measure Thanks to Wayward Satellites

http://www.space.com/42641-einstein-gravitational-time-dilation-galileo-probes.html

The botched launch of two global-positioning satellites four years ago has proven to be a real gift to physicists.

Scientists have used the Galileo 5 and Galileo 6 spacecraft to measure "gravitational time dilation" more precisely than ever before, two new studies reported.

Gravitational time dilation, also known as gravitational redshift, is a key prediction of the theory of general relativity, which Albert Einstein published a century ago. Gravitational fields slow the passage of time; the closer a clock is to a massive object, the more slowly its hands will move, as seen by an outside observer.
>>>

(This article does continue. Along with a mention of 'velocity time dilation.)

Zim.




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The above is a reply to the following message:
Re: What is Twistor Theory? | Roger Penrose AND What came before Big Bang? Why he changed his mind.
By: De_Composed
in GRITZ
Tue, 10 Jun 25 1:11 AM
Msg. 09472 of 09656

Zimbler0:

Re: “Am I right in thinking that scientific experiments have demonstrated that time passes at a slightly different rate outside the earths gravity well?”
I don't think so, no.

Velocity affects time (it slows it.) And a gravity well affects time (by bending space-time.) But merely being IN a gravity well? I think time would move at the same rate for those who are in the well as for those who are outside of it. If you're on the Earth and someone is well away from Earth and not in a gravity well, time will move at the same rate EXCEPT for the fact that the Earth is moving at a pretty good clip.

Traversing a gravity well should affect time, though. That's my best guess.

How to test it? Let's suppose you're on a planet that has Earth's mass and is not in orbit. It's zipping along in a straight line. I am 50,000 miles away in space, moving parallel to you at the same speed. Time would move at the same rate for us both.

Add a third guy who is actively falling into the Earth. Time would pass differently for him. He's traversing the well. I've heard that a person flying into a black hole would never reach it. Time would all but stop for him. The universe would end before he'd reach his target. It wouldn't much matter, though. The black hole's gravity would rip the poor fellow and his ship asunder long before his time slowed appreciably.






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