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

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If a neutrinos can travel through the earth without ever colliding with another particle due to their incredibly small mass, why do photons collide with anything at all when their mass is non-existent?

4851 upvotes

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Since space isn't a complete vacuum does light ever actually travel at the speed of light?

14 upvotes

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How strong is the gravity from Sagittarius A? If the Sun suddenly vanished would Earth and the other planets in our solar system continue to orbit Sagittarius A in the path of the Sun's current orbit or would the momentum of their current orbits send them hurtling through the void of space?

1 upvotes

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Does the Earth have a single large/strong gravity field or does every particle that makes up the earth have a small/weak field and they all work together?

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If gravitons were confirmed to exist would it disprove the idea that nothing can escape a black hole? Assuming that gravitons are the force carrier of gravity how could a black hole exert a gravitational force if the gravitons that exert that force can't escape the event horizon?

1 upvotes

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Because oppositely charged particles are attracted to each other why doesn't the opposite charge between electrons and protons pull them closer than it does? Shouldn't they be stuck together like a pair of neutrally charged conjoined twins?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If a neutrinos can travel through the earth without ever colliding with another particle due to their incredibly small mass, why do photons collide with anything at all when their mass is non-existent?	4851
Since space isn't a complete vacuum does light ever actually travel at the speed of light?	14
How strong is the gravity from Sagittarius A? If the Sun suddenly vanished would Earth and the other planets in our solar system continue to orbit Sagittarius A in the path of the Sun's current orbit or would the momentum of their current orbits send them hurtling through the void of space?	1
Does the Earth have a single large/strong gravity field or does every particle that makes up the earth have a small/weak field and they all work together?	1
If gravitons were confirmed to exist would it disprove the idea that nothing can escape a black hole? Assuming that gravitons are the force carrier of gravity how could a black hole exert a gravitational force if the gravitons that exert that force can't escape the event horizon?	1
Because oppositely charged particles are attracted to each other why doesn't the opposite charge between electrons and protons pull them closer than it does? Shouldn't they be stuck together like a pair of neutrally charged conjoined twins?	1