Comments on: The Speed of Light In Vacuum Is a Universal Constant/2024/08/05/the-speed-of-light-in-vacuum-is-a-universal-constant/The goal of this blog is to create a long list of facts that are important, not trivia, and that are known to be true yet are either disputed by large segments of the public or highly surprising or misunderstood by many.Wed, 12 Mar 2025 06:45:27 +0000hourly1http://wordpress.com/By: 5 Super Facts – Leonberger Life/2024/08/05/the-speed-of-light-in-vacuum-is-a-universal-constant/comment-page-1/#comment-2710Wed, 12 Mar 2025 06:45:27 +0000/?p=146#comment-2710[…] Click here or the picture below to visit Super Fact #4 […]

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]]>By: thomasstigwikman/2024/08/05/the-speed-of-light-in-vacuum-is-a-universal-constant/comment-page-1/#comment-2201Sun, 19 Jan 2025 02:35:17 +0000/?p=146#comment-2201In reply to World Questioner.

World Questioner, as I just mentioned in my previous response to a similar comment you made, I think you misunderstood the post and what universal constant means. It is with respect to speed of light being 299,792,458 meters per second in different inertial systems (moving at a constant speed compared to each other) regardless of the light source. Not the speed of light throughout the history of the universe or in other universes. It’s about remaining a constant as you switch inertial frame, which in itself is very surprising. It has to do with relativity.

Again, the speed of light in vacuum is the inverse of the square root of the electric constant (permittivity of free space) multiplied magnetic constant (permeability of free space) from Maxwell’s equations, but on the contrary to what you seem to be implying, that is what makes the speed of light in vacuum a universal constant. The laws of physics don’t change when you switch inertial frames. This is the principle of relativity and this have been very carefully measured.

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]]>By: World Questioner/2024/08/05/the-speed-of-light-in-vacuum-is-a-universal-constant/comment-page-1/#comment-2185Sat, 18 Jan 2025 16:39:08 +0000/?p=146#comment-2185The speed of light is not an elemental constant. It actually depends on two constants, called vacuum permeability (µ0) and permittivity (ε0).
Is the speed of light an eternal constant? Has the speed of light always been 299,792,458 meters per second? Will it always be for eternity?
Do cosmological constants get established at the end of the Planck era and the beginning of the inflation period? Will cosmological constants break down at the Big Crunch?
Could there exist other universes where cosmological constants are different?

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]]>By: Super Fact Page Added to Superfactful – Leonberger Life/2024/08/05/the-speed-of-light-in-vacuum-is-a-universal-constant/comment-page-1/#comment-2106Wed, 08 Jan 2025 08:33:13 +0000/?p=146#comment-2106[…] (4) The Speed of Light In Vacuum Is a Universal Constant – click to visit […]

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]]>By: thomasstigwikman/2024/08/05/the-speed-of-light-in-vacuum-is-a-universal-constant/comment-page-1/#comment-173Sat, 17 Aug 2024 04:05:29 +0000/?p=146#comment-173In reply to dgkaye.

Ha ha, I think though that it was just a rough start with my blog. A number of people ended up in my spam at the beginning. I should have checked earlier.

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]]>By: dgkaye/2024/08/05/the-speed-of-light-in-vacuum-is-a-universal-constant/comment-page-1/#comment-166Fri, 16 Aug 2024 22:03:10 +0000/?p=146#comment-166In reply to thomasstigwikman.

Lol, no doubts you found me in spam. I’m told I like to hang out in a few people’s spam. I got in the habit of checking spam daily for such reasons. Amazing to find some of our blogging buddies in there many days. 🙂

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]]>By: thomasstigwikman/2024/08/05/the-speed-of-light-in-vacuum-is-a-universal-constant/comment-page-1/#comment-162Fri, 16 Aug 2024 21:27:42 +0000/?p=146#comment-162In reply to dgkaye.

Thank you so much Debby for doing that and commenting. Sorry for the late reply. I had several comments put in the spam folder when the site was brand new. I don’t know what’s up with that but it seems better now.

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]]>By: thomasstigwikman/2024/08/05/the-speed-of-light-in-vacuum-is-a-universal-constant/comment-page-1/#comment-121Mon, 12 Aug 2024 20:19:46 +0000/?p=146#comment-121In reply to Liz Gauffreau.

Yes I think that is a good idea

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]]>By: Liz Gauffreau/2024/08/05/the-speed-of-light-in-vacuum-is-a-universal-constant/comment-page-1/#comment-116Mon, 12 Aug 2024 11:36:12 +0000/?p=146#comment-116When it comes to physics, I’m happy to take the scientists’ word for it!

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]]>By: thomasstigwikman/2024/08/05/the-speed-of-light-in-vacuum-is-a-universal-constant/comment-page-1/#comment-93Mon, 12 Aug 2024 06:22:22 +0000/?p=146#comment-93In reply to da-AL.

Well thank you da-AL. I have to say that I’ve been moving planned posts around a little bit today. Luckily if I change my mind I can just update my list/plan on one post and then copy to all the other posts.

Oh yes I would love to guest post something on your blog.

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