/r/askscience

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Photons have no mass but are affected by gravity. Do photons themselves affect gravity, e.g. could one make a black hole solely from photons?

2807 upvotes • InterstellarGlue

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Covid-19/viruses mutate often, but can Scientists predict certain mutations ahead of time to safeguard via vaccination?

2807 upvotes • Ptrulli

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[Physics] Is entropy quantifiable, and if so, what unit(s) is it expressed in?

2806 upvotes • echisholm

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[Physics] Are there rainbows on other planets? If yes, are their colors the same?

2803 upvotes • bitblogbr

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When early astronomers (circa. 1500-1570) looked up at the night sky with primitive telescopes, how far away did they think the planets were in relation to us?

2802 upvotes • slushhead_00

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What happens to noise energy once you can no longer hear the noise?

2801 upvotes • ClamJamFree

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What's reference point for the speed of light?

2799 upvotes • IwishImadeSense

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Why is a full circle 360 degrees? Why not just a round number like 100 or any other number?

2798 upvotes • Floempie

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How do scientists achieve extremely low temperatures?

2798 upvotes • 2Punx2Furious

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How do we calculate numbers to an irrational exponent like x^pi?

2798 upvotes • ilikebutteryfries

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Photons have no mass but are affected by gravity. Do photons themselves affect gravity, e.g. could one make a black hole solely from photons?	2807	InterstellarGlue
Covid-19/viruses mutate often, but can Scientists predict certain mutations ahead of time to safeguard via vaccination?	2807	Ptrulli
[Physics] Is entropy quantifiable, and if so, what unit(s) is it expressed in?	2806	echisholm
[Physics] Are there rainbows on other planets? If yes, are their colors the same?	2803	bitblogbr
When early astronomers (circa. 1500-1570) looked up at the night sky with primitive telescopes, how far away did they think the planets were in relation to us?	2802	slushhead_00
What happens to noise energy once you can no longer hear the noise?	2801	ClamJamFree
What's reference point for the speed of light?	2799	IwishImadeSense
Why is a full circle 360 degrees? Why not just a round number like 100 or any other number?	2798	Floempie
How do scientists achieve extremely low temperatures?	2798	2Punx2Furious
How do we calculate numbers to an irrational exponent like x^pi?	2798	ilikebutteryfries