Faster than c?

@Akbar2thegreat said in #6:

@absicht_MAUERzuBAUEN
You are wrong. It's not proven that speed of light is 'entity figure'.
There are many things faster than speed of light, haven't you read about objects/planets in space which move much faster than speed of light.
If that’s the case, we will be always dizzy, and the high tides to Low tides interval is like 1 second, and the time to the next earth quakes is less than 10 sec!

@Akbar2thegreat said in #6:

@ absicht_MAUERzuBAUEN
There are many things faster than speed of light, haven't you read about objects/planets in space which move much faster than speed of light.
Like what? 'Objects' as in planets or stars or as in particles?

@obladie said in #16:

yes you can...what part of the word instantaneous are you failing to comprehend?
Besides, that's kind of hilarious because in the framework of Generalised Relativity, "instantaneity" is not a well-defined concept, meaning it depends on the observer. Maybe now you will get headaches...

Speed of light was found out by measuring the visible spectrum of a EMW (electromagnetic wave aka photon) and coincidently it happens to be a universal constant for many things in physics (that why it is denoted by C which stands for constant). The name (speed of light) is misleading because we often think that it's 'just' the speed at which light can travel, it is true but not just for light it is applicable to all EMW (because they are massless)
Note: nothing is believed to travel faster than light but EMW can travel at speed of light and visible spectrum is a small range of the wavelength of photon it can also be microwave, x-ray, gamma ray, etc.

Speed of light is always constant but velocity might differ in every medium as velocity does not depend on path it only depends on the distance between origin and the current position while speed depends on the path. In vaccum both speed and velocity will be equal.

@Akbar2thegreat (in #6) yes you are correct till certain extent, we have found out that the universe is expanding faster than light which means it might end in "big RIP" (thats a whole lot of another story) but don't forget motion is relative. It happens so, That our
galaxy is moving and the galaxy we are observing is also moving in the opposite direction so if you see it this way both of these bodies are moving 1/2C but we perceive the galaxy we are observing is moving apart at speed of light (because we think we are stationary). Oh and also due to this motion of celestial bodies faster than C (in relative context) the observable universe will loose all its stars except for our local cluster and the space will be alone except of milkdromedia galaxy which our future generation would see dw we might find ways to go to other galaxies but thats for another story again.

@Thalassokrator (in #8): WHOA !!! Thats a "LOT" of physics and formulas of which i hardly understand 3 or 4. Are you a physics pro ??

Coming to your question @absicht_MAUERzuBAUEN (in #1)
It is believed that nothing can travel faster than light, It will create time travel paradox like say if a man shot a bullet to person 10m away at 4 times speed of light (around 1,200,000,000m/s) and there was a man observing it at more frames(faster) than a average man then he would observe two scenario based on his state (remember motion is relative)

1. Man died before the gun was triggered (if he was near man who was shot)
2. Both (bullet triggering and man dying) happened at same time (if he was still in between)
   This creates time travel paradox as our universe is in the normal speed of light frame while the bullet was at a speed which was out of our frame and faster thus creating time travel paradox. (It was a bit out my head as well)
   Note: this was based on the theory of "tachyon murder"

And thing that we can increase the velocity (even above speed of light) by providing energy was also given by newton in his 2nd law but due to special relativity it is said that we cannot do so we can only do it till certain extent but not more than speed of light.

@Mantram_PateL (in #14): i dont agree with your fact if we took a torch gave it 1mm/s momentum the light coming out would gain 1mm/s velocity. Instead there will be the Dopplers' effect which will change the wavelength of the light spectrum (due to special relativity) it will become a bit close which will lead to violetshift opposite of redshift (considering the light coming out of the torch is in the same direction as the acceleration applied to the torch.
Note: The color change wont be considerable because of the very less or almost negligible acceleration provided. this might help
Source: www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/red-shift?modal=1

Lemme explain special relativity as i talked about it twice (or thrice?)
Suppose a hypothetical bus traveling at speed of light and a passenger sitting in it with a mobile. The light coming from the mobile will travel at speed of light as it does but the bus (so the passenger) is moving in opposite direction of the direction of light so the observer will perceive the light at 2 times the speed of light Which is not possible the only way to avoid this if the distance between observer and the phone is infinitely small. For that to happen the bus has to somehow squeeze in the direction its moving (as it moving straight the longitudinal of the bus will contract) which is true. The bus which is moving at speed of light has to squeeze infinitely so no physics law is broken thats what the relativity theory is for it makes sure that no law of physics is broken from any perspective or reference. It is also true that when you move by a car the car squeezes(at microscopic level).
Confused right?
Source: m.youtube.com/watch?v=vVKFBaaL4uM
And another: m.youtube.com/watch?v=1TKSfAkWWN0

Lol nice to see so many "physics nerds" XD (JK)

Dont see ahead if you want to be in peace...
To conclude things very nicely un-confusingly neutrino can travel faster than light... i guess you might Have figured that out of from the end of the video. Lemme eaze out things its still under debate.

Read:
https://bigthink.com/technology-innovation/what-travels-faster-than-the-speed-of-light/

@Akbar2thegreat reading it is one thing, maybe now you should try to understand.

@I_love_cricket said in #9:

Any possibility that Einstein was your great grandfather and he explained all that to u?

Sadly no. But that would have been so cool :-) But I had enthusiastic maths and physics teachers who diligently taught me the high school maths needed for my post #8.
I envy the people who were privileged enough to have the opportunity to discuss physics with Albert Einstein! Einstein, if anything, is underrated as a physicist!

(Although to a lesser degree than other greats like William Rowan Hamilton, Emmy Noether, Lise Meitner [!], Wolfgang Pauli, John von Neumann, Enrico Fermi, etc.)

I saw the title, and thought the thread was about the C programming language :)

But that would be C not c.

@FC-in-the-UK said in #26:

@Akbar2thegreat reading it is one thing, maybe now you should try to understand.
It is you and others who need to understand. Speed of light may be ultimate speed in this universe only not all universes.
And there are many things faster than light.
Light is the relative speed which compares which object travels with greater or lower speed.
Theory of relativity fits well and is scientifically correct but sadly it cannot explain why light is the ultimate speed.
Just for basic thing how is light in comparison to others, watch:
https://youtu.be/F-jwrpXPBp0