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

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Most marine mammals are either saltwater or freshwater exclusively. How can manatees survive in both?

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Given that high concentrations of mass/energy curve spacetime into black holes, why didn't the extremely dense/hot early universe immediately become nothing but black holes?

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If gravity propagates at the speed of light, how does it propagate from the center of a black hole to the event horizon?

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Do the paths of photons and massive objects bend the same way around a gravity source?

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Does thermal mass always scale linearly with regular mass?

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Is it possible (or practical) to bend a beam of light with electromagnetic or electrostatic force?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Most marine mammals are either saltwater or freshwater exclusively. How can manatees survive in both?	1
Given that high concentrations of mass/energy curve spacetime into black holes, why didn't the extremely dense/hot early universe immediately become nothing but black holes?	1
If gravity propagates at the speed of light, how does it propagate from the center of a black hole to the event horizon?	1
Do the paths of photons and massive objects bend the same way around a gravity source?	0
Does thermal mass always scale linearly with regular mass?	0
Is it possible (or practical) to bend a beam of light with electromagnetic or electrostatic force?	0