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[Spacedaily] Scientists find evidence for speed of gravity - Page 4

post #31 of 192
The research probably causes cancer, knowing China.
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post #32 of 192
Soooooooo many people posting before reading anything about the article LOL baaasmiley.gif:

It is not the rate of acceleration which is already known. It is the rate at which gravity affects another body. Its hard for me to wrap my head around testing this, but that's why we have scientists
post #33 of 192
Quote:
Originally Posted by sebkow View Post

Dont think that the speed of light will be our gravity. It will of course alter for different planets and all. Just like the black holes gravity is faster then the speed of light.

Gravity is not faster than light at a black hole, what happens is that when a photon approaches a black hole, it falls into it and cannot escape because of the curvature that the black hole creates in spacetime. That's like saying "Wires with electricity create a magnetic field, but light can come out of it, therefore light is faster than the electromagnetic force" even though light and electromagnetism are the same thing. All of the forces are carried by massless particles, and in special relativity that means that they must move at the speed of light.
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post #34 of 192
Quote:
Originally Posted by sebkow View Post

yup
Quote:
Originally Posted by JMattes View Post

So to make a.long story short.. if I were to drop my tooth brush it is falling at the speed of light?

No.
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post #35 of 192
On Earth, the acceleration from Gravity is ~9.8 m/s^2 (dependent on where you are standing when measuring this: 9.78-9.83 m/s^2). Those of you who are asking why a certain object doesn't fall faster when you drop it, that is velocity not acceleration. There are many other things that factor in when considering velocity; these "things" are called resistances (you know friction (caused by air or molecules).

The acceleration due to gravity is different on ever planet or star. For example, near the sun, scientists calculate the acceleration to 274.1 m/s^2, while the acceleration on mercury is 3.703 m/s^2.

As for the speed of gravity itself (not the objects it acts upon), it is the speed at which changes in a gravitational field propagate.

In other words, you cannot compare the rate at which an object falls on earth (gravity) to the velocity at which gravity moves.
Edited by JRuxGaming - 12/30/12 at 5:08pm
post #36 of 192
Quote:
Originally Posted by Sir Amik Vase View Post

The distance covered per unit time of a (Currently theoretical) graviton.
Yeah I felt kinda dumb after fully reading the article. Silly me...
post #37 of 192
China has been on a roll lately.
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post #38 of 192
Guys this ISN'T saying that gravity causes you to fall at the speed of light. It means the force caused by the gravitational field takes 1 planck second to travel 1 planck distance (1 planck distance/1planck second = speed of light).

In other words, let's say a large mass suddenly came into existence somewhere. Now let's say you were 1 light year away from that mass. So although the radius of the field permeates all of space, you would only observe the effects of that field 1 year after the mass suddenly came into existence. (Assuming neither you or the mass move relative to one another)
post #39 of 192
Quote:
Originally Posted by Edge Of Pain View Post

Guys this ISN'T saying that gravity causes you to fall at the speed of light. It means the force caused by the gravitational field takes 1 planck second to travel 1 planck distance (1 planck distance/1planck second = speed of light).
In other words, let's say a large mass suddenly came into existence somewhere. Now let's say you were 1 light year away from that mass. So although the radius of the field permeates all of space, you would only observe the effects of that field 1 year after the mass suddenly came into existence. (Assuming neither you or the mass move relative to one another)

Yep, or reverse it: If the sun were to instantly vanish (unrealistic, but whatever), the earth would continue to "orbit" it as long as we could see it, since the update in gravity (the curvature of space-time) had not reached us yet. Then once we saw that the sun no longer existed (since the lighted had stopped reaching us) we would stop orbiting, since space-time would have reverted to a flat-state. Its cool, but also insane. It means technically speaking, we would orbit NOTHING for about 8 minutes.
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post #40 of 192
Still awaiting for solution to disprove relativity and find a way to go faster than the speed of light!

Laughs
Edited by That_guy3 - 12/30/12 at 5:56pm
    
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