/r/askscience

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How do we know that mass compressed into a space below its Schwarzschild radius collapses into a singularity, rather than some non-singularity density?

996 upvotes • random-dent

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Why are prions so hard to destroy?

996 upvotes • shieldyboii

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On behalf of my 8th grade students: If you mixed liquid nitrogen and lava and toxic waste, what will happen? If you can't answer that, only mix lava and liquid nitrogen.

995 upvotes • apeacefulworld

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Two objects leave Earth at the same time for Alpha Centauri 4,37 lightyears away. The other object travels at 99,9% speed of light, and the other at 10% c. Considering time dilation, how far apart in time do they arrive?

995 upvotes • nipsu333

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Why does waking up with an alarm make you feel more tired then waking up naturally even if the time you woke up naturally is before the alarm?

995 upvotes • Dognado

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What's underneath the sand at the beach? How far does the sand go and what is beneath that?

995 upvotes • Skrilllexxx

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In a turbofan engine, what provides the thrust?

995 upvotes • rogthnor

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why doesn't Jupiter, if it is constantly absorbing large asteroids, `fill up`with rock and and become a rock planet?

994 upvotes • warmfun

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Is it possible to optically observe individual atoms?

994 upvotes • Nyroc_

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If the light omitted on the far side of a galaxy is significantly older than that of the front side, why isn't the shape distorted?

994 upvotes • defire101

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
How do we know that mass compressed into a space below its Schwarzschild radius collapses into a singularity, rather than some non-singularity density?	996	random-dent
Why are prions so hard to destroy?	996	shieldyboii
On behalf of my 8th grade students: If you mixed liquid nitrogen and lava and toxic waste, what will happen? If you can't answer that, only mix lava and liquid nitrogen.	995	apeacefulworld
Two objects leave Earth at the same time for Alpha Centauri 4,37 lightyears away. The other object travels at 99,9% speed of light, and the other at 10% c. Considering time dilation, how far apart in time do they arrive?	995	nipsu333
Why does waking up with an alarm make you feel more tired then waking up naturally even if the time you woke up naturally is before the alarm?	995	Dognado
What's underneath the sand at the beach? How far does the sand go and what is beneath that?	995	Skrilllexxx
In a turbofan engine, what provides the thrust?	995	rogthnor
why doesn't Jupiter, if it is constantly absorbing large asteroids, `fill up`with rock and and become a rock planet?	994	warmfun
Is it possible to optically observe individual atoms?	994	Nyroc_
If the light omitted on the far side of a galaxy is significantly older than that of the front side, why isn't the shape distorted?	994	defire101