Posted on 12/07/2018 12:39:21 PM PST by ETL
Making lemonade from lemons, two teams of physicists have used data from misguided satellites to put Albert Einstein’s theory of gravity, the general theory of relativity, to an unexpected test.
The opportunistic experiment confirms to unprecedented precision a key prediction of the theory—that time ticks slower near a massive body like Earth than it does farther away.
As Einstein explained, gravity arises because massive bodies warp space-time. Free-falling objects follow the straightest possible paths in that curved space-time, which to us appear as the parabolic arc of a thrown ball or the circular or elliptical orbit of a satellite.
As part of that warping, time should tick more slowly near a massive body than it does farther away. That bizarre effect was first confirmed to low precision in 1959 in an experiment on Earth and in 1976 by Gravity Probe A, a 2-hour rocket-born experiment that compared the ticking of an atomic clock on the rocket with another on the ground.
In 2014, scientists got another chance to test the effect when two of the 26 satellites now in Europe’s Galileo global navigation system, like the one pictured above, were accidentally launched into elliptical orbits instead of circular ones. The satellites now rise and fall by 8500 kilometers on every 13-hour orbit, which should cause their ticking to speed up and slow down by about one part in 10 billion over the course of each orbit. Now, two teams of physicists have tracked the variations and have shown, to five times better precision than before, that they match the predictions of general relativity, they report 4 December in Physical Review Letters. That’s not bad, considering the satellites weren’t designed to do the experiment. However, another experiment set to be launched to the space station in 2020 aims to search for similar deviations with five times greater precision still.
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We have had several clocks in a zero gravity dive in aircraft.
Since the centrifugal force is highest at the equator, why does it seem that people there are shorter, on average ?
OK. What is your explanation for gravity ?
Much like the concept that everyone else is dumber than us.
An ‘artificially produced’ zero gravity.
Gravity doesn't have a frequency. Gravity is an effect of motion...or rather a slowing of motion.
It works like this: The entire universe is expanding. This means that our reality, all matter, space and time is expanding.
However this expansion gets "slowed" by all objects. Think of the objects as "grabbing" space time near them and slowing it down. However it takes truly massive objects to slow down this expansion.
Take the sun...it slows down the expansion quite a bit. What we call "gravity" around the sun is really a slowing down of the general expansion of space/time. All objects within this local slowdown of space time are caught in this area of slow down.
Same way with the earths gravity. We escape the earth's gravity when we go faster than how much earth is slowing down space time in it's region.
That's why there's time dilation when we travel faster...the faster we go the more we "catch up" to the general rate of expansion of space time.
So in order to time travel we would have to invent something that would "grab" spacetime and practically stop the expansion of space/time within a limited area.
SO.... if it weren’t for the SUN, we would all be immortal.
lol...never thought about it THAT way. Unfortunately we would die. But in a weird way that's right from a religious standpoint. Once we're not bound by the rules of space/time.....that we're outside of space/time in a body that's not bound by space/time then yes it would follow that immortality would be the result!
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Yes it is artificially produced, but it works.
My Theory of Relativity
Time moves slower when the relatives are visiting.
I think ucansee2 is thinking that the larger effect of gravity on the atoms (or electrons or whatever) may be slowing the motion of the atoms down, hence slowing down the clock.
I imagine a pendulum clock would keep a much different time on earth than the moon. I have no idea if atoms would be affected by gravity.
As far as I know, unless the gravitational field is really immense, such as with a black hole, individual atoms are not affected by gravity. Other forces at that level are much stronger.
Where did you get that from?
From trying to figure out what gravity was! :-)
To clarify for others, I only wrote: “Where did you get that from?”
You wrote: “Gravity is an effect of motion...or rather a slowing of motion.”
So, it's something you thought up yourself? Or did you see or hear about it somewhere? If so, please provide a link or reference.
Ok. I'm not sure what you're driving at.
It's something I've stumbled on upon thought and reflection. I don't have a link and I'm not even sure it's accurate. I'm sure that others have thought the same thing.
But it's based upon the famous example of gravity where they put a heavy object like a bowling ball on trampoline like surface and then throw a tennis ball or something around it so it spins around.
The problem with that model is that the trampoline is supposed to represent space/time. So to get an accurate picture you have to imagine that you're within that fabric. Further we KNOW that space/time is expanding so we have to imagine ourselves within that fabric as it is constantly stretching, or expanding, around us...always.
I think this is what Einstein was modeling with his math but we have tough time imagining it so we default to the trampoline explanation.
Ah so...thanks.
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