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Does time go slower underwater?

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TimFox:
Charged particles all have mass, and therefore must travel slower than c, the speed of light in a vacuum.  However, when a massive charged particle has a velocity higher than the speed of light in a dielectric medium (such as water or gas), the result is called Cherenkov radiation, see https://en.wikipedia.org/wiki/Cherenkov_radiation which is named after the Soviet physicist who discovered it.  It is somewhat similar to the shock wave produced by an aircraft traveling faster than the speed of sound in a medium ("sonic boom").

cliffyk:
I had a friend some years back who felt quite strongly that time travel was impossible. I told him "Nonsense we are doing it right now, we just cannot (yet?) control the velocity and direction."

GlennSprigg:

--- Quote from: cliffyk on July 14, 2020, 03:35:45 am ---I had a friend some years back who felt quite strongly that time travel was impossible. I told him "Nonsense we are doing it right now, we just cannot (yet?) control the velocity and direction."

--- End quote ---
There's the old conundrum, regarding someone saying that "Maybe we can travel back into the past, because
that's already happened, but not into the future".  However, it then goes to the 'logic' that if we went back into
the past, we would meet people that would see US come from THEIR future! It can't only work one way...   :)

P.S.   Your photo at the bottom of your post, reminds me of the 3D 360-deg '.HDR' image files!!
See the free software/viewer link below, which doesn't even need to be installed...
https://www.lizardq.com/en/viewer/
And some example .HDR files to use, from...
https://www.lizardq.com/en/sample-images/
All created from the 2D .JPG representations.  Quite interesting!!!   8)

cliffyk:

--- Quote from: GlennSprigg on July 15, 2020, 12:06:10 pm ---
--- Quote from: cliffyk on July 14, 2020, 03:35:45 am ---I had a friend some years back who felt quite strongly that time travel was impossible. I told him "Nonsense we are doing it right now, we just cannot (yet?) control the velocity and direction."

--- End quote ---
There's the old conundrum, regarding someone saying that "Maybe we can travel back into the past, because
that's already happened, but not into the future".  However, it then goes to the 'logic' that if we went back into
the past, we would meet people that would see US come from THEIR future! It can't only work one way...   :)

P.S.   Your photo at the bottom of your post, reminds me of the 3D 360-deg '.HDR' image files!!
See the free software/viewer link below, which doesn't even need to be installed...
https://www.lizardq.com/en/viewer/
And some example .HDR files to use, from...
https://www.lizardq.com/en/sample-images/
All created from the 2D .JPG representations.  Quite interesting!!!   8)

--- End quote ---

It's a built-in image stitching function of an old (10-12 years?) Canon Elph I keep in the shop...

StillTrying:

--- Quote from: GlennSprigg on July 15, 2020, 12:06:10 pm ---However, it then goes to the 'logic' that if we went back into the past, we would meet people that would see US come from THEIR future! It can't only work one way...   :)
--- End quote ---

You're forgetting there's an infinite number of universes. ::)
https://www.ranker.com/list/time-traveler-pictures/ashley-reign

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