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

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Since, from an outside perspective, matter takes an infinite amount of time to cross an event horizon, how does the black hole form or grow in the first place?

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How are we able to smell smells that didn't exist 100 years ago?

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How does a black hole form/grow if, from the perspective of an outsider, nothing can ever cross the event horizon?

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Given enough time, could a planet's core cool down completely?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Since, from an outside perspective, matter takes an infinite amount of time to cross an event horizon, how does the black hole form or grow in the first place?	1
How are we able to smell smells that didn't exist 100 years ago?	1
How does a black hole form/grow if, from the perspective of an outsider, nothing can ever cross the event horizon?	1
Given enough time, could a planet's core cool down completely?	1