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Agreeable_Highway_26 t1_j2aaj2n wrote

Reply to comment by majorpickle01 in has the speed of light always been constant? by 2bornnot2b

If it did change for E=mc^2 to hold AND conservation of energy to hold would there not need to be a large change in the amount of mass in the universe?

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majorpickle01 t1_j2ab6qi wrote

Admittedly I wouldn't be the best person to ask as I haven't studied science in nearly a decade, but my uneducated educated guess would be a change in the value of c is balanced out by other factors, probably something to do with dark energy.

In a sense the changing rate of expansion of the universe due to dark energy is what is causing the change in c. But that's just 100% made up of the top of the bonce. Hopefully someone with a more advanced and recent education can give you a good answer.

Key point is things don't change just because. There's always a reason fundamentally

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