All Questions
43
questions
8
votes
5
answers
1k
views
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
3
votes
2
answers
86
views
Tug of war between observers in frames with different rate of time
You have a very dense hollow sphere of matter. Observer A is inside the sphere inside a rocket. Observer B is in an identical rocket outside the sphere where the ring's gravity is negligible. They are ...
- 171
0
votes
1
answer
71
views
On the equivalence principle
In its simplest version, it states that
the effects of a uniform gravitational field are indistinguishable from those of a uniform linear acceleration of the frame of reference
The thing is, you can ...
- 1,644
0
votes
3
answers
124
views
Relativity and variable time - there is an alternate formulation where time is always linear. Has it been studied?
Lorentz, Einstein et. al. assume time is the variable which changes in a gravity well or as speed approaches $c$. That's the commonly accepted model.
For nearly 50 years I've wondered if anyone else ...
- 19
3
votes
4
answers
835
views
Gravitational Time Dilation and the Apparent Speed of Light
It has been proven that time far away from Earth is faster than time on the surface of Earth, due to gravitational time dilation. (GPS satellites take gravitational time dilation to account.)
Would ...
- 141
7
votes
4
answers
2k
views
Could a civilisation use “inverse time dilation” to live longer?
If an observer were to live near a black hole of sufficient mass, half an hour could elapse for them, but the outside universe could progress hundreds of years. This is due to time dilation.
We know ...
- 179
-3
votes
3
answers
454
views
Does time really slow near the speed of light or does it only seem that way to an outside observer? [duplicate]
I was lying awake last night struggling to sleep as one does, thinking about time and Einstein's concepts of relativity and having some fun with thought experiments similar to the one Einstein ...
3
votes
2
answers
531
views
Using time dilation to find universal frame of reference
Before I ask this question, I just want to clarify that I am by no means an expert and that this question most likely came about due to my ignorance on the subject. If this is the case, please let me ...
- 567
2
votes
1
answer
74
views
Would an accelerated-time space region deflect projectiles?
Suppose a spherical region in space in which time goes faster.
Would projectiles shot at it be deflected away, as light is deflected by a material with a lower refractive index?
Edit: This would also ...
- 123
2
votes
0
answers
73
views
Frame of Reference chosen in Hafele-Keating experiment
I do not understand why we chose the frame of reference which is at rest with respect to Earth's center. I get that it does not experience the acceleration due to centripetal force of Earth's rotation ...
0
votes
4
answers
294
views
Time slows down with speed compared to what reference point?
So as far as I understand time dilation it means that time slows down as an object approaches lightspeed. This is an issue even with for example satellites around earth compared to people on earth (...
- 111
1
vote
2
answers
2k
views
How much Earth time passes over a 1000 lightyear journey?
Ok, so I'm writing a sci-fi novel featuring a lot of interstellar travel. I was wondering how much time would pass, from an Earth-based perspective, if I were to travel 1000 lightyears from Earth, and ...
- 1,552
2
votes
0
answers
39
views
If someone in freefall towards earth used a telescope to look at someone in a spaceship accelerating at 10m/s/s, would they see their clock run fast?
Basically I'm quite confused about relativity haha. I've been told that the only two things that affect whether you'll observe someone else's clock ticking at a different rate than yours are
Your ...
1
vote
4
answers
527
views
What mechanism will force mechanical watch to tick slower when go fast, due to relativistic effects? [duplicate]
To make mechanical watch tick slower, watch tick rate must be changed, oscialtion of balance wheel must be SOMEHOW changed, how would speed change oscialtion of balance wheel, due to relativistic ...
- 613
0
votes
1
answer
83
views
If the Earth is placed between three spinning black holes, Will time on Earth slow down? Will we live longer?
Just randomly thought of placing the Earth equidistant from 3 spinning black holes. Will time on the Earth slow down? Will we age slower? Assuming that the Earth is not past the event horizon yet the ...
- 9