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

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Richard Feynman said, "It is important to realize that in physics today, we have no knowledge what energy is. We do not have a picture that energy comes in little blobs of a definite amount." Is this statement still true today with the new discoveries that LHC is making?

568 upvotes

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If I lit a candle in space on a spaceship then what would the flame shape look like since there is no gravity?

565 upvotes

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So now we know that the universe inflated faster than the speed of light. Do we know exactly how much faster than c?

71 upvotes

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I know the speed of light is 186,282 miles per second. But do we understand why nature pick/evolved to this number? Is there a physical/mechanical reason for it?

71 upvotes

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why doesn't an atomic bomb cause a chain reaction and start spitting and exploding other atoms around it?

52 upvotes

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The electromagnetic field is one where the electric field is 0 but the The Higgs field has a non-0 value everywhere. What does that mean? It's an energy field with constant charge?

50 upvotes

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If two people are in a dark room and a single photon is fired to the wall. Which person sees/absorbs the photon?

24 upvotes

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I have a penny from 1920. Does science know if the subatomic particles (like quarks, etc) in my penny today are the exact same subatomic particles from 1920?

13 upvotes

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When a movie projector's light hits the screen the atoms on the screen create new photons that our eye sees. But how do the light proprieties of the original photons transfer to the new photons?

8 upvotes

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If we didn't have Einstein then was there someone else on the verge of discovering relativity?

6 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Richard Feynman said, "It is important to realize that in physics today, we have no knowledge what energy is. We do not have a picture that energy comes in little blobs of a definite amount." Is this statement still true today with the new discoveries that LHC is making?	568
If I lit a candle in space on a spaceship then what would the flame shape look like since there is no gravity?	565
So now we know that the universe inflated faster than the speed of light. Do we know exactly how much faster than c?	71
I know the speed of light is 186,282 miles per second. But do we understand why nature pick/evolved to this number? Is there a physical/mechanical reason for it?	71
why doesn't an atomic bomb cause a chain reaction and start spitting and exploding other atoms around it?	52
The electromagnetic field is one where the electric field is 0 but the The Higgs field has a non-0 value everywhere. What does that mean? It's an energy field with constant charge?	50
If two people are in a dark room and a single photon is fired to the wall. Which person sees/absorbs the photon?	24
I have a penny from 1920. Does science know if the subatomic particles (like quarks, etc) in my penny today are the exact same subatomic particles from 1920?	13
When a movie projector's light hits the screen the atoms on the screen create new photons that our eye sees. But how do the light proprieties of the original photons transfer to the new photons?	8
If we didn't have Einstein then was there someone else on the verge of discovering relativity?	6