All Questions
Tagged with spacetime time-dilation
251
questions
32
votes
4
answers
9k
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Why isn't the center of the galaxy "younger" than the outer parts?
I understand that time is relative for all but as I understand it, time flows at a slower rate for objects that are either moving faster or objects that are near larger masses than for those that are ...
- 469
26
votes
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
19
votes
9
answers
4k
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Twins Paradox: Why is one frame considered to be the accelerating frame
Let me start by saying I understand the Mathematics behind the twins paradox and how it is resolved. I understand that due to the acceleration of one twin, time from their subjective experience is ...
- 323
18
votes
6
answers
4k
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Is it possible to watch the same distant star's supernova event twice?
Usually relativistic time dilation effects require something traveling near the speed of light. But the high speed requirement can be replaced with a high distance requirement instead. Traveling away ...
- 376
17
votes
4
answers
13k
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Why does everyone say that the faster you move through space, the slower you move through time, when that's not the case?
Suppose, I'm on earth and my brother is moving away from earth at a constant speed, $v=0.8c$. Now, if 5 seconds $(t_0)$ pass for me, the amount of time that will pass for my brother according to me ...
- 1,018
13
votes
9
answers
3k
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How does gravitational time dilation affect matter?
Einstein successfully melded together space and time into one entity called spacetime in his General relativity theory and gave us further insight into how matter affects spacetime.
John Wheeler said “...
- 719
12
votes
2
answers
2k
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How do we know the assumptions of the Schwarzschild solution are valid?
The Wikipedia article on the derivation of the Schwarzschild solution (https://en.wikipedia.org/wiki/Derivation_of_the_Schwarzschild_solution) lists 4 assumptions. The second of which is:
A static ...
- 1,011
10
votes
8
answers
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Do physicists understand why time slows down the faster the velocity of an object? [duplicate]
Like do they understand the mechanism behind it? Is there a mechanism behind it? (for a lack of a better word) Or is it just thought to be a law without any further explanation?
- 361
8
votes
5
answers
1k
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Do you always experience the gravitational influence of other mass as you see them in your frame?
You see a galaxy far away. That galaxy is attracting you with a certain amount of gravity. I'm wondering if the gravity influence of the galaxy on you, as measured by you, always ends up being what ...
- 171
8
votes
3
answers
2k
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Does gravitational redshift imply gravitation time dilation?
The EEP is used to justify that if an observer on the ground shoots a beam of light towards a tower, then when the light reaches the tower, it will be red shifted. This is because of what happens in ...
- 1,707
8
votes
3
answers
697
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Can the Lorentz transformations be derived this way?
This approach is seeming intuitive to me as I can visualize what's going on at each step and there's not much complex math. But I'm not sure if I'm on the right track or if I'm making some mistakes. ...
- 6,355
7
votes
1
answer
366
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How does time behave inside a massive spherical shell?
According to General relativity the clocks in our satellites in the atmosphere tick faster than those on Earth, as they are farther from the gravitational well of Earth and are free falling.
...
- 5,568
7
votes
2
answers
359
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The twin paradox and positively curved space
I'm reading about the twin paradox in special relativity - if there are two identical twins, one of whom who sets off in a high speed rocket to a planet, and then heads back, will find the twin who ...
- 379
6
votes
2
answers
459
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Is light affected by space warping or time warping?
Gravity, according to the General Theory of Relativity, is simply the curvature of space-time. Objects in the universe move through space-time in geodesic paths. Also, the most interesting part is ...
6
votes
1
answer
311
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Twin paradox with one twin in orbit, one in radial free-fall
Many questions on Physics SE relate to the twin paradox, but I did not find any that ask this specific question. Suppose that object A is in a circular orbit around a spherically symmetric, non-...
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