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geekhack Community => Off Topic => Topic started by: ANightOnCloudNine on Sat, 09 January 2016, 19:31:21

Title: planck speed at planck distance vs a slow speed at planck distance. whats diff?
Post by: ANightOnCloudNine on Sat, 09 January 2016, 19:31:21

this thought has bothered me for a while. anyone who's more enlightened about physics care to explain to me?

Title: Re: planck speed at planck distance vs a slow speed at planck distance. whats diff?
Post by: tp4tissue on Sat, 09 January 2016, 20:38:24

what is planck speed.. ? do you mean speed of light.

Title: Re: planck speed at planck distance vs a slow speed at planck distance. whats diff?
Post by: ANightOnCloudNine on Sun, 10 January 2016, 01:51:15

Quote from: tp4tissue on Sat, 09 January 2016, 20:38:24

what is planck speed.. ? do you mean speed of light.

yes, it's the diff name for speed of light, cause speed of light can differ in a vacuum and in a medium, aka the vacuum of space and the air.

Title: Re: planck speed at planck distance vs a slow speed at planck distance. whats diff?
Post by: Melvang on Sun, 10 January 2016, 02:27:40

One thing is the speed of light constant, is actually the max possible in a vacuum, not actual speed through other mediums.

Title: Re: planck speed at planck distance vs a slow speed at planck distance. whats diff?
Post by: berserkfan on Sun, 10 January 2016, 10:41:01

Correct me if I am wrong but doesn't gravity influence the speed of light as well?

Title: Re: planck speed at planck distance vs a slow speed at planck distance. whats diff?
Post by: ANightOnCloudNine on Sun, 10 January 2016, 19:33:35

Quote from: berserkfan on Sun, 10 January 2016, 10:41:01

Correct me if I am wrong but doesn't gravity influence the speed of light as well?

I'm fairly certain yes.

Title: Re: planck speed at planck distance vs a slow speed at planck distance. whats diff?
Post by: Melvang on Sun, 10 January 2016, 19:45:50

From my understanding from this page, gravity doesn't affect the light, but affects the medium it travels through.


http://physics.stackexchange.com/questions/59502/does-gravity-slow-the-speed-that-light-travels

No matter how you look at it, the topic gets much more complicated than what it appears on the surface.

Title: Re: planck speed at planck distance vs a slow speed at planck distance. whats diff?
Post by: berserkfan on Sun, 10 January 2016, 21:38:06

If speed is constant that's fine, but who's observing? What is your ray of light going to do?

If space is warped by that black hole, then you will never observe the light no matter what speed it can move. So this planck constant is a theoretical speed, but no observer can ever see the light go from place A to B since in a black hole everything is in the same place squashed together.

Now that's a singularity. But the universe originated also from a singularity. So there can be no visible light present when the universe began. That's why we can never observe what went on before the Big Bang or whatever they now call that moment when the Universe began? Planck constant, like all the laws of physics, becomes useless in a singularity?

Title: Re: planck speed at planck distance vs a slow speed at planck distance. whats diff?
Post by: ANightOnCloudNine on Sun, 10 January 2016, 23:01:05

Quote from: Melvang on Sun, 10 January 2016, 19:45:50

From my understanding from this page, gravity doesn't affect the light, but affects the medium it travels through.


http://physics.stackexchange.com/questions/59502/does-gravity-slow-the-speed-that-light-travels

No matter how you look at it, the topic gets much more complicated than what it appears on the surface.

i guess only massive amounts of gravity affect light considering a black hole can bend time itself too.