[talanum1 (OP)]

It was detected that gravity moves at the speed of light. Not so long ago Electromagnetic waves was found to move at the speed of light and it was concluded that therefore Electromagnetic waves = light.

Now we have other radiation moving at the speed of light. So shouldn't it be re-evaluated to conclude gravity = light?

[Kartazion]

Artificial light attracts bugs but not matter. And with natural light when measuring weight on earth would not have the same value at night as during the day.

[Bored chemist]

So shouldn't it be re-evaluated to conclude gravity = light?

Well... sort of.
But the reevaluation shouldn't take long.
Does gravity still exist in the dark?
Yes, it does.
Does light still exist in the dark?
No it doesn't
So light is not the same as gravity.

OK, that's the reevaluation finished.

The question now is "how come you didn't realise that for yourself?".

[Origin]

So shouldn't it be re-evaluated to conclude gravity = light?

What?!  No, just no.

[puppypower]

It was detected that gravity moves at the speed of light. Not so long ago Electromagnetic waves was found to move at the speed of light and it was concluded that therefore Electromagnetic waves = light.

Now we have other radiation moving at the speed of light. So shouldn't it be re-evaluated to conclude gravity = light?

Gravity has other properties that can shed insight. For example, mass and gravity causes local space-time to contract via General Relativity. If we were in a space ship that was moving with increasing velocity, space-time will also contract; Special Relativity.

What this tells me is gravity is designed to move matter in the general direction of the speed of light reference since as matter collects, space-time contracts more and more. The black hole approximates this final goal. Gravity is not so much light, as it tries to push matter back to the speed of light reference of light. Mass burn, due to gravity induced pressure and nuclear fusion, does this directly when it turns mass into energy; photons. There is a quantum jump from the inertial frame of mass, to the speed of light frame of photons.

The universe formed from a speed of light reference and is heading back with all roads leading to this path. The forces of nature, by all giving off energy when potential lowers turns inertial affects into speed of light affects.

An interesting affect is the universal red shift. The red shift makes wavelength longer but frequency gets slower. The time aspect appears to be based on space-time contraction while the distance aspect is based on space-time expansion. Since time is the dynamic variable; clock,  and distance is the passive variable; meter stick, the expansion is being led by time contracting back to infinite wavelength and zero frequency. This is the speed of light time reference but inertial distance reference. Light is the bridge between the speed of light and inertial references with gravity moving things along that bridge.

[Bored chemist]

What this tells me is gravity is designed

Who is the designer?
Do you realise this is a science page?

[evan_au]

It was detected that gravity moves at the speed of light.

True, LIGO and optical telescopes detected the same neutron-star collision within hours of each other: So they travel at pretty much the same speed.

But this merely provided confirmation of the predictions of Einstein's General Theory of Relativity, a century before: that gravity and light would travel at exactly the same speed.
- You can have waves in any medium, whether that be water, guitar strings, organ pipes, the electromagnetic field (light/radio waves) and spacetime (gravity waves)
- But this does not mean that they are all the same thing

We have subsequently realised that the universe has a quantum nature.
- Light is carried by photons, a Spin=1 massless particle https://en.wikipedia.org/wiki/Photon
- Gravity is almost certainly carried by gravitons, a  Spin=2 massless particle https://en.wikipedia.org/wiki/Graviton
- According to Relativity, the only way a massless particle can carry energy (such as light detected by your eyes, or gravitational waves detected by LIGO) is if they travel at a particular speed, called "c".

So light must travel at c, and gravitational waves must travel at c.
- We call c "the speed of light" because that is the context in which it was first measured
- But we may as well call it "the ultimate speed limit of the universe", which applies to both light and gravity.

Because of their different Spins, Photons and Gravitons are very different particles, and are carried by very different fields.

Light≠Gravity

[talanum1 (OP)]

The question now is "how come you didn't realise that for yourself?".

I didn't know how to think of it: stupid of me.