All Questions
14
questions
1
vote
2
answers
132
views
Do events very far away happen in a different timeline?
I am not sure how to ask this question in a concise manner so I am sure somebody out there explained it but I cannot seem to find it.
So I recently watched some videos explaining that $c$ not only ...
- 119
0
votes
1
answer
67
views
Can we observe a more recent space?
The space we are viewing now is their distant past as their light has only reached our eye or telescope after travelling a long distance at the speed of light. However, for lights that are still on ...
3
votes
1
answer
106
views
How does the second postulate of special relativity imply invariance of spacetime interval?
I have trouble understanding why the second postulate of Special Relativity implies the invariance of spacetime interval $\Delta s^2=-c^2\Delta t^2+\Delta x^2+\Delta y^2+\Delta z^2$.
Suppose we have ...
- 209
0
votes
0
answers
40
views
Twin paradox symmetry in time dilation during the first leg [duplicate]
I was watching this Ted Ed video on Youtube about the twin paradox and found the explanation with the spacetime graph a bit confusing. At 3:00 in the video, they show a graph and explain how bursts ...
7
votes
6
answers
7k
views
If you travel on car with nearly the speed of light and turn on the car headlights: will it shine in gamma light instead of visible light?
If you travel on car with nearly the speed of light and turn on the car headlights: will it shine in gamma light instead of visible light?
- 768
-5
votes
1
answer
209
views
Is This Why the Speed of Light is Universally Invariant?
Please could you tell me if the following is an original thought or whether this is already understood. I ask because I am undertaking a piece of writing on the nature of spacetime. What I discuss ...
- 129
5
votes
1
answer
1k
views
How can we perceive light if light doesn't move through time? [duplicate]
From my understanding in space-time everything moves at the speed of light $c$ in some direction of this four dimensional space. Light itself moves only through space, so it doesn't move at all in ...
- 225
2
votes
4
answers
180
views
How do we know that experimental evidence of special relativity can't be attributed to other, unrelated effects? [closed]
While there are many experimental results that seem to align with the predictions of special relativity--some examples being muons from the upper atmosphere reaching the Earth's surface despite their ...
- 365
0
votes
1
answer
52
views
Transformation of space at almost the speed of light from different observers
I hear this a lot in documentary movies, where they claim that if you would be able to travel through space near the speed of light, then things would seem squished, the Earth would seem like a 70 ...
0
votes
1
answer
97
views
To Be Forever Young [duplicate]
It is clear from the Lorentz Parameters, applied to Einstein's Equations, that as velocity, v approaches speed-of-light, c, the denominator (1 - [v/c]) tends to zero; when v=c, time, t=0: time stops?!
...
- 207
0
votes
1
answer
51
views
The contact binary star system in Cygnus
Astronomers are predicting that they will combine in 2020. Thus creating a red nova that will be visible to the naked eye here on earth. The stars are about 1,800 light years from earth.
My question ...
- 1
0
votes
1
answer
115
views
What (if any) significance exists in the analogy between the speed of light limit and the Schwartzchild radius of a black hole
I have always been intrigued by what seems to be very similar characteristic of the phenomena of traveling very, very fast, (close to the speed of light , and the Schwartzchild radius.
AS a body gets ...
- 190
-1
votes
5
answers
677
views
Why Light and Observers have different laws of physics [closed]
Special relativity states:
The speed of light in a vacuum is always $c$, regardless of the velocity of the observer.
The laws of physics are the same for all observers in uniform motion.
These two ...
- 125
0
votes
2
answers
1k
views
Time dilation at the speed of light
Does a massless particle travelling at the speed on light in a vacuum (c) experience an infinite time dilation effect?
i.e. Would the time dilation extend from the perspective of the massless ...
- 111