Scientists validate Einstein’s theory of relativity on a galactic level

eg2505

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#2
didnt they already prove this theory with Concorde and atomic clocks slowing down?
 

konfab

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#3
didnt they already prove this theory with Concorde and atomic clocks slowing down?
**technically** that only proves relativity works on a scale the size of earth. It doesn't say anything about the scale of something like the distance between galaxies. We know GR breaks down at an atomic level, therefore we know the theory has limits. Studies like these help find where those limits are so work can be done on them.

Newtonian gravity for example, works perfectly on certain scales (like the moon going around the earth), but fails with cases like Mercury going around the Sun.
 

eg2505

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#4
you might be right about that^^^
but dont some space probes carry atomic clocks? like voyager 1 and 2?

or even curiosity rover, or other spacecraft flying around the solar system. that have radioactive power sources?

cant their signals be compared to local earth bound atomic clocks, and show that time onboard the spacecraft has slowed down.
thereby proving the theory?
 

furpile

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#5
I saw an article about this last week with a bit more detail in it. I think they wanted to prove it works outside our solar system, and on a galactic scale. No probe has gone outside the solar system yet.
 

eg2505

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I saw an article about this last week with a bit more detail in it. I think they wanted to prove it works outside our solar system, and on a galactic scale. No probe has gone outside the solar system yet.
hasn't voyager 1/2 not done so already?
left the solar system?
 

konfab

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#7
you might be right about that^^^
but dont some space probes carry atomic clocks? like voyager 1 and 2?

or even curiosity rover, or other spacecraft flying around the solar system. that have radioactive power sources?

cant their signals be compared to local earth bound atomic clocks, and show that time onboard the spacecraft has slowed down.
thereby proving the theory?
Make no mistake, the theory by all intents and purposes is as proved as we get. GPS is evidence of that.

What this study is looking for is places where the theory might have some holes. Given how it predicts the motions of the planets and all objects in the solar system perfectly, verifying it by sending an atomic clock to the edges isn't going to tell us much.

None of the space probes carry atomic clocks because at the distances where such readings would be useful, you would not be able to communicate with said clocks. This is why they look at other methods like gravitational lensing, which can give you a good idea of how the theory behaves at a much further distance.
 

patrick123

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#8
you might be right about that^^^
but dont some space probes carry atomic clocks? like voyager 1 and 2?

or even curiosity rover, or other spacecraft flying around the solar system. that have radioactive power sources?

cant their signals be compared to local earth bound atomic clocks, and show that time onboard the spacecraft has slowed down.
thereby proving the theory?
Most satellites need their time adjusted, about 7 microseconds a day. Google Satellite Time Dilation.

You get dilation by speed and you get dilation by gravity.
 

AlphaJohn

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#9
hasn't voyager 1/2 not done so already?
left the solar system?
Yes and no and maybe.

Voyager 1 is outside solar bubble of influence but not totally in "open" space yet. Voyager 2 is on the outer limits of the "bubble".
 

eg2505

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#10
Yes and no and maybe.

Voyager 1 is outside solar bubble of influence but not totally in "open" space yet. Voyager 2 is on the outer limits of the "bubble".
but it is Nuclear powered correct? so its possible for it to keep operating for centuries?
why cant it be used to prove relativity with its internal clock, being slower than local earth clocks?
 

konfab

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#11
but it is Nuclear powered correct? so its possible for it to keep operating for centuries?
why cant it be used to prove relativity with its internal clock, being slower than local earth clocks?
The problem is the clock it has wouldn't be accurate enough to determine the effects. This thread on quora 3 years ago claims the total time dilation would be about 9.2 seconds in the future.
https://www.quora.com/Since-time-is-relative-how-much-time-has-passed-for-Voyager-1-in-comparison-to-Earth

The problem is you would need a clock that looses less than that amount over the then 35 years.

For that, you need an atomic clock.
https://en.wikipedia.org/wiki/Deep_Space_Atomic_Clock
 

Swa

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#13
didnt they already prove this theory with Concorde and atomic clocks slowing down?
That was focused on time not the curvature of space. But really I don't see how this rules out anything. We've known about gravitational lensing for decades on a smaller scale but it's still possible gravity is the result of something else.
 
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