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

By: De_Composed in GRITZ | Recommend this post (0)
Tue, 10 Jun 25 5:53 AM | 11 view(s)
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Msg. 09482 of 09705
(This msg. is a reply to 09481 by Zimbler0)

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Zimbler0:

Re: “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.”
I didn't know that. Thanks for correcting me!





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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: Zimbler0
in GRITZ
Tue, 10 Jun 25 5:25 AM
Msg. 09481 of 09705

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.

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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.
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(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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