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Old 14th October 2021, 10:47 AM   #121
hecd2
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Originally Posted by Mike Helland View Post

I don't think +/- 10 micro Kelvin is as strong as evidence where there are super clusters/voids, but you're entitled to your opinion.
...and you know too little to have an opinion.
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Old 14th October 2021, 11:15 AM   #122
Mike Helland
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Originally Posted by hecd2 View Post
...and you know too little to have an opinion.
Indeed.

But I know more now than I did when I believed in the big bang.

It could have happened.

I have my doubts.

Have a nice day.
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Old 14th October 2021, 12:39 PM   #123
Reality Check
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Originally Posted by Mike Helland View Post
...
It can only be weak gravitational lensing, because strong lensing requires the background to be close to the foreground.

Since you believe the CMB light is 14 billion years old, no strong lensing can occur.

Unless... the CMB photons aren't the oldest ones around.
Yet more abysmal ignorance from Mike Helland.
Strong gravitational lensing produces multiple images like the Einstein Cross because the lensing object is sufficiently dense.
Weak gravitational lensing is weak . Detection needs statistical measurements.

We know the CMB passing through superclusters produces weak gravitational lensing because we do not detect strong gravitational lensing! We have to do statistical analysis to find the lensing. This is weak gravitational lensing. We expect there to be no strong gravitational lensing because superclusters are not dense enough to produce it.

The CMB photons are the "oldest" photons around that we can detect without a time machine Before they were emitted photons were continuously absorbed and emitted by a universe in a hot dense state.
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Old Yesterday, 08:20 AM   #124
Mike Helland
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Speaking of gravitational lensing. This is pretty amazing.

https://scitechdaily.com/supernova-d...g-in-16-years/

An enormous amount of gravity from a cluster of distant galaxies causes space to curve so much that light from them is bent and emanated our way from numerous directions. This “gravitational lensing” effect has allowed University of Copenhagen astronomers to observe the same exploding star in three different places in the heavens. They predict that a fourth image of the same explosion will appear in the sky by 2037. The study, which has recently been published in the journal Nature Astronomy, provides a unique opportunity to explore not just the supernova itself, but the expansion of our universe.
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