Linked Questions
62 questions linked to/from Would time freeze if you could travel at the speed of light?
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Does a photon in vacuum have a rest frame?
Quite a few of the questions given on this site mention a photon in vacuum having a rest frame such as it having a zero mass in its rest frame. I find this contradictory since photons must travel at ...
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10
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2
answers
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What is the size of the world for a photon?
At relativistic speeds the distances contracts. What is the contraction ratio in the dimensions along the axis of travel between a static observer and a photon passing by?
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5
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Would a navigator announcing ship velocity whle approaching lightspeed make linear announcements?
Given my admittedly limited understanding of relativity, I believe that as a hypothetical space ship approaches the speed of light at a constant acceleration, what the crew would "see" on ...
- 158
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2
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How can photons interact with anything?
I read photons do not age because they move at the speed of light. So when a photon interacts with my eyes, aren't they apart in space-time by the difference of the time in the frame of reference of ...
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How do we know that there is more than one photon in the universe?
Excuse this possibly dumb question and correct me - i am not a physicist, but i wondered:
A photon is massless and travels with lightspeed, which means for the photon itself, that time stands still ...
- 61
2
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2
answers
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How can massless gluons interact with each other?
Massless particles, such as photons and gluons, move with the speed of light and consequently experience no time. According to Special Relativity, time stops at the speed of light. As a result, ...
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4
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Why Sun light can reach us if Time is dilating? [closed]
I understand that if something is moving with constant speed in respect to an observer, the time of the moving one runs slower, so the more your speed is, the more your time ticks slower.
Which ...
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2
answers
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Can a photon exiting from a gravity well ever reach a frequency of zero / wavelength of $\infty$?
In reading another question about gravity's effects on a photon, I wondered if it were possible for a photon to ever be redshifted to zero wavelength.
I know that black holes have a gravity field ...
- 181
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4
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Frame of reference of a photon [duplicate]
I'm curious about the fact that it is impossible to consider a frame of reference where a photon is the reference itself (meaning a frame of reference where this photon can't move).
I looked for ...
user343933
0
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1
answer
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Does a photon travel through space exactly at the speed of light?
In practice, given that in the vacuum of the universe is not perfectly empty, does the photon actually reach exactly c?
Is it even possible? If it travels at exactly c, then from the photon ...
- 221
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vote
3
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Length contraction speed of light
The Special Theory of Relativity tells us that a moving object eg spaceship measures shorter in its direction of motion as its velocity increases.
At the speed of light it would have zero length, but ...
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3
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If time is relative, how could time pass? [duplicate]
EDIT:
I appreciate people who answered below. But it does not answer the question, so I will clarify my questions:
-It seems like everyone is saying that time passing is actualized by physical ...
3
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2
answers
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Do photons have absolute motion?
Absolute rest is not possible as the concept of motion is relative. But can we assert that photons have absolute motion as the observers in all the frames of reference would agree to the same value of ...
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3
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Is it possible to defy time using speed? [closed]
I have always wondered if we were to travel at past the speed of light (even beyond the current capability) would we be able to slow down time around us? I have asked my teacher at school and he has ...
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3
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Can light exist if it never interacts with anything? [closed]
I've heard some physicists mention that photons do not experience time. From the perspective of the photon, it begins and ends instantaneously.
With all the photons shooting out into empty space, it ...
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