/u/inexister's posts in /r/askscience

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How do ancient cities get buried under more modern ones?

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Why is the observable redshift of galaxies extrapolated backwards to a single point of origin? Is that not a logical fallacy when other explanations could be equally plausible? Think of an expanding balloon, it started as a deflated balloon not a singular point in spacetime.

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How does redshift demonstrate anything more than a temporal shift or expansion of the universe as opposed to a long term one?

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I keep hearing people say the universe is 13.8 billion years old, but isn't that only the age of the visible universe?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How do ancient cities get buried under more modern ones?	78
Why is the observable redshift of galaxies extrapolated backwards to a single point of origin? Is that not a logical fallacy when other explanations could be equally plausible? Think of an expanding balloon, it started as a deflated balloon not a singular point in spacetime.	1
How does redshift demonstrate anything more than a temporal shift or expansion of the universe as opposed to a long term one?	1
I keep hearing people say the universe is 13.8 billion years old, but isn't that only the age of the visible universe?	1