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swimfeeders
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swimfeeders is offline
Shropshire
Joined: Oct 2014
Posts: 24,056
swimfeeders is male  swimfeeders has posted at least 25 times and has been a member for 3 months or more 
 
14-07-2019, 09:56 AM
11

Re: Amazing Photograph.

Hi

The speed of light which we use as a constant is the speed of light in a vacuum.

This can be measured accurately.

This speed is finite and works perfectly with the famous E=Mc2.

We know that the speed of light is different in a medium, for instance glass.
Realist
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Realist is offline
UK
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Posts: 9,184
Realist is male  Realist has posted at least 25 times and has been a member for 3 months or more 
 
14-07-2019, 04:56 PM
12

Re: Amazing Photograph.

I believe Surfermom and I have talked about the principle involved here.

A chap called Greg Braden also uses it in his inspirational presentations where he posits that we can make physical changes in the universe through the power of thought. He calls it the "Divine Matrix"

Check out the You Tube videos here:

https://www.youtube.com/watch?v=gKxl91U3ufI
Donkeyman
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Donkeyman is offline
Melton,United Kingdom
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14-07-2019, 08:02 PM
13

Re: Amazing Photograph.

Originally Posted by swimfeeders ->
Hi

The speed of light which we use as a constant is the speed of light in a vacuum.

This can be measured accurately.

This speed is finite and works perfectly with the famous E=Mc2.

We know that the speed of light is different in a medium, for instance glass.
I think l get it Swimmy, Einstein based his theories using
the highest speed in a vacuum, which we can measure, as
the constant for his equations! But l still have a query?
On lights journey from its source to us, surely it passes
various high gravity fields on its way here, sometimes
approaching them, and sometimes leaving them, this must
surely affect its speed one way or another? What did Einstein
do about this? Did he then use the average speed to do his
sums?

Regards Donkeyman!
swimfeeders
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swimfeeders is offline
Shropshire
Joined: Oct 2014
Posts: 24,056
swimfeeders is male  swimfeeders has posted at least 25 times and has been a member for 3 months or more 
 
14-07-2019, 11:49 PM
14

Re: Amazing Photograph.

Hi

An answer from NASA,

Is Light Affected By Gravity?

Is light affected by gravity? If so, how can the speed of light be constant? Wouldn't the light coming off of the Sun be slower than the light we make here? If not, why doesn't light escape a black hole?

Yes, light is affected by gravity, but not in its speed. General Relativity (our best guess as to how the Universe works) gives two effects of gravity on light. It can bend light (which includes effects such as gravitational lensing), and it can change the energy of light. But it changes the energy by shifting the frequency of the light (gravitational redshift) not by changing light speed. Gravity bends light by warping space so that what the light beam sees as "straight" is not straight to an outside observer. The speed of light is still constant.

Dr. Eric Christian
 
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