All Questions
25
questions
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Is it more accurate to say space in a weaker gravitational field is contracted, or that time is faster?
Little thought experiment. An observer places a mirror and a clock 1 lightyear away from a black hole. He then goes in the black hole's gravitational field at a point where he sees the clock tick at 2 ...
- 171
-2
votes
2
answers
60
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Time dilation query [closed]
In the light clocks, time ticks via the motion of light and since speed of light is constant therefore when the clock is in motion ,the photon has to cover a greater distance by the perspective of an ...
0
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2
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61
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Can Shapiro Time Delay cause light in a vacuum to go faster than c as viewed from a remote reference frame?
I know within any reference frame the speed of light is fixed. But it has been shown that light does appear to slow down when passing massive objects as viewed from a remote reference frame per https:/...
- 319
1
vote
2
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274
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Time and speed of light in Relativity
Time running slower near a massive object, but the speed of light does not really change near a massive object, according to Relativity - it just curves. Is not time directly related to the speed of ...
- 103
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1
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86
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Time dialtion when objects run in the same direction
Just trying to understand the basics.
I saw some videos claiming that when you run towards light the speed of light may appear to be faster than C therefore time corrects it by being slow.
Now the ...
user325851
-3
votes
2
answers
168
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How speed of light is absolute/constant if time (denominator) is relative?
Speed is path / time.
How speed of light in vacuum can be always constant if denominator (time) is relative, its changing?
If speed of light must be constant then path must be changed as well?
- 613
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3
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390
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This question is about time dilation but a bit different
See the image below-
Here I have decribed a scenario related to relativity theory. A spaceship is travelling at "V" velocity relative to a man standing on planet. The Spaceship's frame is ...
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190
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Special relativity with horizontal mirror clock? [duplicate]
Every explanation video about special relativity comes with a constantly moving train and a vertical (according to the train's speed direction) mirror clock. So first of all, why in the classical ...
- 101
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35
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How to travel between two stationary worlds in the least amount of proper time?
I was intrigued by this question about minimizing the travel time between two worlds that are at rest with respect to each other, and disappointed that the answer turned out to be trivial. However, I ...
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26
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4
answers
4k
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How to travel between two stationary worlds in the least amount of time? (time dilation)
Let's imagine there are two, isolated, stationary worlds in space (called A and B), very far apart from each other. I live on World A, and some aliens live on World B.
I want to learn about the ...
- 363
2
votes
1
answer
141
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Why is light affected by time dilations in space-time curvatures
My previous question on this site gave me an answer to what affects light - space warping or time warping. The answer is- both. But what now doesn't make sense to me is why light is affected by time ...
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4
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726
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Light moving toward a moving observer's reference frame
The speed of light is supposed to be the same for all observers in an inertial frame, no matter the observer's speed. As a result, time slows down for observers moving quickly, and this explains why ...
- 171
2
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0
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148
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Can someone travelling close to the speed of light witness the end of the universe? [closed]
I have read that objects with non-zero rest mass cannot attain light speed $c$. But for the sake of this question let us assume that Mr. X can get as close to $c$ as he wants. So this means that an ...
- 41
3
votes
4
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677
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How close should you get to speed of light, in order for time to be dilated?
Recently I was watching Carl Sagan's Cosmos: A Personal Voyage. In episode 8 ("Journeys in Space and Time") there is a scene presenting the idea of time dilation, due to traveling close to the speed ...
user187075
2
votes
1
answer
132
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Does the center of a star age faster than its relativistic equatorial surface? If so, how does it maintain its speed and spherical shape?
Imagine a massive (the diameter is millions of miles across) star rotating on its axis at relativistic speeds. Assume, now, that the center of the star is stationary. Note that the center of the star ...
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