All Questions
95
questions
-1
votes
4
answers
98
views
Does the speed of light determine how slow time can move?
Since moving faster makes time move slower. Does that mean that there is an absolute minimum rate at which time passes? If so. Is there also a maximum?
- 127
-1
votes
1
answer
178
views
Can we consider that the photons that were not and will never be detected live in a zero-dimensional space? [closed]
According to Einstein’s theory of relativity, any particle traveling at the speed of light experiences no passage of time. It follows that if a photon travels through space then within any two points ...
- 115
2
votes
1
answer
546
views
How do they set the clocks on spacecraft visiting several other planets?
Scientists have sent spacecraft into distant space passing nearby other planets on the voyage. How do they set the clocks to adjust for kinetic time dilation (special relativity) and gravitational ...
- 4,783
-1
votes
1
answer
48
views
Relationship between clock rate and speed
Let's consider example:
The propagation of light from the middle of a moving train to its left and right ends. From the point of view of a train passenger, the light will reach the right and left ends ...
- 149
-1
votes
2
answers
116
views
Does special relativity imply that there's such a thing as absolute time, or base time?
If time measured by one observer moving at a greater velocity than another observer is observed to be passing more slowly, does this imply that there's such a thing as "absolute time" or &...
-11
votes
2
answers
374
views
Has the Twin Paradox Really Been Resolved? Interesting peer-reviewed paper states that it hasn't been resolved [closed]
Has the Twin Paradox really been resolved? Here is an interesting peer-reviewed paper Has the Twin Paradox Really Been Resolved? (RG) which states that it hasn't been resolved:
Of particular interest ...
0
votes
6
answers
385
views
Time dilation and understanding which is $\Delta t$ and which is proper time $\tau$
In the textbook that we are using, the definition for proper time $\tau$ is the interval between two events, as measured by an observer who is at rest with the two events. The definition for $\Delta t$...
-4
votes
2
answers
119
views
Relativity theory inconsistency
Suppose I have two synced clocks, light-based for simplicity (light bouncing between mirrors up and down).
A train comes by me at some velocity u and I put one of the clocks on the moving train.
...
- 11
1
vote
11
answers
1k
views
Sabine Hossenfelder says time dilation is due to acceleration in the twin's paradox. Is this true?
Sabine Hossenfelder says time dilation is due to acceleration in the twin's paradox. Is this true?
At 12 minutes into this video https://www.youtube.com/watch?v=ZdrZf4lQTSg, Hossenfelder states, &...
2
votes
5
answers
355
views
Special Relativity and Hypersurface of Simultaneity?
In Special Relativity when I move backwards and forwards my hypersurface of simultaneity moves too.
Does time really oscillate backwards and forwards as I move around? Or is it just the application of ...
- 65
1
vote
5
answers
497
views
Is relativity of simultaneity an "observer issue"?
There are some threads about this, but some answers seem to disagree.
First, this is what Einstein said on this matter:
The light rays emitted by the flashes of lightning A and B would reach him ...
- 11
-2
votes
2
answers
148
views
How meaningful is the notion of 'now' here on Earth? [closed]
So special relativity and the lack of a now moment is causing me a bit of grief.
My friends and families notion of "now" doesn't ever line up with mine; but how much of a difference does ...
- 65
0
votes
0
answers
118
views
Is it theoretically possible to watch events of 1985 with near light speed travel & a big enough telescope? [duplicate]
James Webb allows us to see stars as they were thousands of years ago. So what about seeing Earth of 37 years ago.
For nostalgic purposes I’d like to watch myself aged 12 in 1985, perhaps outside on ...
- 1
-4
votes
3
answers
203
views
Twins Paradox: Back on Earth, same moment? (and always) [closed]
Supposing twin A, having been on a well-known circular near-light-speed journey, returns to Earth a younger man than twin B.
Let's say A took off at 3pm and upon return has aged 2 hours while B has ...
- 383
0
votes
2
answers
239
views
Is time measured, a property of the object or of the frame in which the object is observed? [closed]
I'm a bit confused behind the idea of the twin paradox. Suppose we fix a given frame, then in this given frame, wouldn't all objects read the same time making twin paradox meaningless as everyone ...
- 7,980