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The universe is not infinite, and if each of our neurons were a universe for like... molecules, it would not be infinite, just incomprehensibly large. And I agree, I have often thought about how our universe could be the equivalent of a cell for an even larger organism.
Hubble's Constant states a body's recession speed at a given distance from us (approximately). Therefore, we can get an educated guess at distances by measuring a star/galaxy/whatever's redshift.
When you think about something so amazing and complex as your brain, it makes sense that such an idea that we are apart of something bigger. I personally think it involves God and how we may relate to him, but I know a lot of people don't agree with that stuff. Still I believe it, so I'll put it out there.
crazy to thinkabout