# Why is light speed constant?

Discussion in 'BlackHat Lounge' started by Glum93, Apr 29, 2016.

1. ### Glum93Registered Member

Joined:
Mar 28, 2016
Messages:
54
10
So, after watching a special theory of relativity video, I immediately ask the question, why is speed of light constant? Why the ball moves faster for the stationary person compared to the person on the truck and not with light. Why ball and not light. I speculate and in minutes I got the answer. Now, when I search in google or youtube, I don't find the answer, it seems like most people still think it's mysterious, so, I'm not sure whether I know something that the whole world doesn't know or what? So, I want to first ask you guys, and then I will explain later in this post itself. I want to know if there is actually someone who knows the answer.

Added: Alright, seems like most people here are busy making money. So here goes - because everything is relative to light and when we measure light, light being the observer of light itself, so light speed cannot be faster than itself is it? It's actually very simple to understand if you have no background in physic, I completed only 10th grade and so with novice mind in physic, I immediately get it, but had I studies physics for 4 years, I would obviously be able to explain anything in such a way that normal people won't understand but I won't be able to understand higher end things which require you to get out of the box.

So, let's say when a ball moves at 5 km/hour, the ball move at 5 km/hour because light falls on the ball and reflex to my eye and from images, it form a video and so we see the ball moving. Had the speed of light doubles, we would see the ball moves much slower because there would be more images of the ball. So, it's a very simple phenomena but who cares, nothing can travel even at the 10% of speed of light anyway, so why bother. But, I sometime tackle such questions because I see some people dedicate their whole life to understand these things.

And as to why the speed of light is 300,000 km/sec, the answer is similar to why our body is 37 degree or why water freezes at 0 degree, it's the quality of an element. But why the light on the train doesn't increase for the observer on the ground, it is simply because he using his eye/light to observe the light, so when you see something in the mirror, you see yourself, you can't see something else.

Thanks

Last edited: Apr 29, 2016
2. ### toml3030Elite Member

Joined:
Aug 16, 2014
Messages:
2,344
820
As I understand it, because speed of light isn't constrained by space; as in speed of light is totally independent of the observer or the source of the light, so anyone measuring the speed of light under any circumstances will measure it at the same speed.

3. ### rpkrocksBANNEDBANNED

Joined:
Feb 4, 2010
Messages:
1,039
971
Gender:
Male
You should study quantum physics, It's much more hocus pocus.

4. ### Glum93Registered Member

Joined:
Mar 28, 2016
Messages:
54
10
Why light isn't constrained by space. I have answered it in OP.

Please discuss whether I actually put it correctly.

5. ### jazzcModeratorStaff MemberModeratorJr. VIP

Joined:
Jan 27, 2009
Messages:
2,891
12,791
Occupation:
Potentate
Location:
Asuncion
That the speed of light is constant in all inertial reference frames is an axiom. There is no "why". The axiom is empirically verified but there is no proof of it in the classic sense.

• Thanks x 2
6. ### Skyebug77Jr. VIPJr. VIP

Joined:
Mar 22, 2012
Messages:
2,501
1,842
Occupation:
Marketing
Location:
Portland,Or
Here is a video that explains it

Last edited by a moderator: May 18, 2016
7. ### jazzcModeratorStaff MemberModeratorJr. VIP

Joined:
Jan 27, 2009
Messages:
2,891
12,791
Occupation:
Potentate
Location:
Asuncion
Where? It only describes what does it mean that the speed is constant.

8. ### pewepPower Member

Joined:
Nov 3, 2008
Messages:
661
3,012
Gender:
Male
Occupation:
Yogi-In-Training
Location:
U.S.
That's just the way it is. I don't think there are any solid explanations why light moves the way it does (maybe general relativity explains it better?).

9. ### BleghtBANNEDBANNED

Joined:
Feb 18, 2016
Messages:
548
172
Because it seems that that's the way the universe works according to the data we've gathered so far. It makes sense because it's been carried by massless particles and that's what Einstein's equation would suggest for that case, but that's kind of a self-referential way of putting it.

Joined:
Mar 22, 2012
Messages:
2,501