Comments by "Mosern1977" (@Mosern1977) on "Evidence for Big Bang Cosmology" video.

Can someone explain to me how the universe managed to cool down, if no place was cooler than any other place?
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@felicityc - eh, can you make a tldr of that one please....
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@hanss1754 - why would expansion cause temperature to decrease?
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@hanss1754 - this hypothetical effect would only apply to light, and how quickly can you drop from billions of degrees using this effect?
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@hanss1754 - well, where does the lost energy go in a universe with nothing but photons...
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@hanss1754 - well, at some point normal physics kicks in, and we leave fantasy land. At that point, I assume the theory is that everything is still pretty damn hot. Using normal known physics, explain how - when everything is hot - and nothing is cold - anything will cool down?
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@hanss1754 - well, fantasy land is where you have speculative physics that has not been experimentally verified. And that is stuff like Dark Matter, Dark Energy, Inflation, expanding universe, etc. Then you have particle physics and standard model and general relativity and quantum mechanics. Things that are experimentally tested and verified. That is not fantasy land. So Cosmology is mainly working in fantasy land, but from time to time the try to use concepts from actual physics, since that lends a bit of creditability to their fantasy models. Saying things like the universe cools down as it expands sounds like misuse of gas-laws. In a world where everything is hot, and assuming energy should be conserved, why would the temperature go down just because the universe is expanding?
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@hanss1754 - "Cooling of the universe is simply an effect of the De Broglie wavelength increasing due to the redshift effect" - first time I've heard this explanation. And I assume this redshift is caused by the supposed expansion of space?
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@StaticBlaster - that is not correct. It only applies to very specific circumstances which are not present in open space.
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