Linked Questions

0
votes
0answers
30 views

“Speed” of gravity? [duplicate]

This is probably going to be a poorly written question, since I know really a little of physics. Imagine a object of small mass, let's say a book, is floating in the universe in absence of any ...
6
votes
4answers
6k views

How does gravity force get transmitted?

How does gravity force get transmitted? It is not transmitted by particles I guess. Because if it was, then its propagation speed would be limited by the speed of light. If it is not transmitted by ...
18
votes
4answers
8k views

Do all massless particles (e.g. photon, graviton, gluon) necessarily have the same speed $c$?

I suppose there was a discussion already on speed-of-gravity-and-speed-of-light. But I silly wonder whether all the massless mediators of four fundamental forces, i.e. Graviton: $g_{\mu\nu}$ (...
124
votes
10answers
17k views

How fast does gravity propagate?

A thought experiment: Imagine the Sun is suddenly removed. We wouldn't notice a difference for 8 minutes, because that's how long light takes to get from the Sun's surface to Earth. However, what ...
0
votes
1answer
71 views

Why $c$ as speed of change in gravity [duplicate]

Consider two bodies where say body B is in gravitational field of A Now we move body A with much needed speed so as to produce observable results. Now as I read that this information that A has ...
1
vote
2answers
883 views

Does gravitational force tend to zero over large distances?

I have a couple of questions about gravity, here's my thinking: The Sun exerts a gravitational force on the Earth, keeping it in orbit. The Sun is made up of trillions of atoms, as is the Earth. ...
1
vote
1answer
117 views

Why is the speed of gravity the same as that of photons? [duplicate]

Why is it that the speed of massless particles in space is the same as propagating disturbances of space? We can´t send human information (with photons) faster than the speed of light. But we can ...
2
votes
0answers
69 views

Are gravitational waves constrained by special relativity (speed of light)? [duplicate]

In Lawrence Krauss's excellent book "Universe from Nothing" and his related lectures, he cites findings of the BOOMERANG-instrument observations in Anarctica as used to measure the diameter of ...
0
votes
1answer
219 views

Is it sure that gravitons are massless bosons? [duplicate]

Possible Duplicate: “Speed” of Gravity and Speed of Light I'm wondering if gravitational waves have the same speed of light? They must if gravity is mediated by a graviton spin 2 ...
2
votes
1answer
128 views

Gravity is Instant [duplicate]

Without being able to manipulate gravity. How do we know that gravity is restricted to the speed of light? or gravitational effects from an exploding star would be felt (if we were near) before we ...
9
votes
4answers
340 views

Why should gluons move at a speed determined by $\mu_0$ and $\varepsilon_0$?

I understand that the speed of light can be derived from Maxwell's equations, giving $c=\frac{1}{\sqrt{\mu_0\varepsilon_0}}$ I furthermore understand how the principle of invariance of laws w.r.t. ...
-2
votes
2answers
1k views

Shouldn't gravity travel at light speed immediately?

If gravity travels at $c$ (light speed), why aren't objects pulled to Earth at that speed? Since the velocity of gravity is 9.8 meters per second squared, will it eventually accelerate until it ...
16
votes
2answers
928 views

Does gravity travel at the speed of light? [duplicate]

Whenever I did calculations in high school physics involving gravity, it was either "a ball falling to the earth" type scenario, or a basic measurement of the gravitational attraction between two ...
0
votes
0answers
52 views

Gravity propagation speed [duplicate]

Related to: How fast does gravity propagate? In the related question and in many other questions here, it seems as if the propagation speed of the gravitational interaction is $c$. To my ...
0
votes
4answers
225 views

Questions about the speed of light and the extent of the universe

What is the reason that speed of light is the maximum speed in the universe? Why there is no speed swifter than light? Or is it just we haven't found yet? A similar question is like this: why the ...