Where does the extra space come from as the universe expands? and if it’s just stretching, does that mean it somehow is getting thinned out?
In: 47
Q1, you’ve stumbled onto an unknowable answer. No one knows what is beyond the edge of the universe. It expands so fast that it outpaces the fastest we could possibly go with any sort of technology. Teleporting to it wouldn’t even work, it was be gone before you could look at it.
Q1-ELY5: IT JUST DOES, GO TO SLEEP.
Q2, yes. The universe is being stretched out. The amount of matter in the universe is always the same, and gravity keeps that matter together, but the distance between it constantly getting farther apart.
Q2-ELY5: You’re eating Cheerios. There’s only enough cereal to float on top of the milk, and it only covers have the surface. Those pieces tend to form a few clumps that seem to stick together. If you poured that milk into a wider bowl the cereal will still clump together even though the surface is larger. The clumps will be farther apart. Same matter, same clumps, bigger gaps.
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