re: If the universe is 93 billion light years across, how is it only 14.5 billion years old?

So the same thing? The heat death being the cessation of the movement of everything because no energy. Whenever the last black hole evaporates or red dwarf burns out I suppose? Haven’t thought about this in a while.

Also for those interested here is a baby pic of our universe called the cosmic microwave background radiation. The different colors represent irregularities (my understanding anyways) in the very first moments of time that manifested themselves as inflation took hold.

Yes and no. The galaxies aren’t speeding away (well they are moving but that’s not what we’re talking about), the spacetime in between you and the galaxy is expanding.

Imagine an elastic rope with balls spaced at equal intervals and then someone pulls on each end. The balls themselves aren’t moving, the elastic rope they are on is expanding.

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So the same thing? The heat death being the cessation of the movement of everything because no energy.

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Yes, the same thing. Although, of course, we still don’t know what dark energy is, just its effects.

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Everything is checking out so far for the big bang type start. I don't think that will really change. What's more likely is that we may find out the big bang is just one of many in a cycle, or one of many with parallel universes

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EventHorizon

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Checks out.

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Universe is expanding faster than the speed of light

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My apologies if already discussed but I have trouble grasping this. If it is expanding, what is it expanding into? What void is there.

Lets say the universe is only 10 miles wide. What is there are the end of 10 feet?

It’s not expanding into anything, the universe is simply expanding. Everything is expanding away from everything else, there’s no center nor edge.

Expansion of the universe

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But anyway the universe is expanding faster than the speed of light is how he explained it in one video.

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Space is expanding far faster than light and has been ever since the Big Bang. The space between matter groupings such as galaxies is expanding faster and faster the farther away you look. And that speed is ever increasing. We can only see a limited distance, the observable Universe, because galaxies at the cosmological horizon (of the observable Universe) are receding faster than light.

In fact, 96% of the galaxies we see now have passed beyond the coslological horizon since they emitted the light that we see. It will take billions of years for their last light to reach us, but there will be no more.

This stuff really blows my mind though. And another guy explained how the universe may be in a trillion years. That, is a trillion years. Said there won't be much left to see. But there will be a lot of stuff out there. And I'm really going to show my ignorance here but this makes sense. All elements on this planet heavier than hydrogen and helium are the product of fusion to heavier elements in long destroyed stars. Ok, I see that.

Yes, that's what he said. For those of us who rarely think about this it is confusing. But yes matter can't travel faster than the speed of light. But expansion can. Thise were the two different YT videos.

SOL
Yeah, Don Lincoln. If you know all this stuff, you know him.

Did you ever take a physics class?