Author Topic: NASA Announces Results of Epic Space-Time Experiment  (Read 7368 times)

Offline Conrad

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NASA Announces Results of Epic Space-Time Experiment
« on: May 17, 2011, 09:10:18 am »
http://science.nasa.gov/science-news/science-at-nasa/2011/04may_epic/

Einstein was right again. There is a space-time vortex around Earth, and its shape precisely matches the predictions of Einstein's theory of gravity.

Researchers confirmed these points at a press conference today at NASA headquarters where they announced the long-awaited results of Gravity Probe B (GP-B).

"The space-time around Earth appears to be distorted just as general relativity predicts," says Stanford University physicist Francis Everitt, principal investigator of the Gravity Probe B mission.


An artist's concept of GP-B measuring the curved spacetime around Earth.

"This is an epic result," adds Clifford Will of Washington University in St. Louis. An expert in Einstein's theories, Will chairs an independent panel of the National Research Council set up by NASA in 1998 to monitor and review the results of Gravity Probe B. "One day," he predicts, "this will be written up in textbooks as one of the classic experiments in the history of physics."

Time and space, according to Einstein's theories of relativity, are woven together, forming a four-dimensional fabric called "space-time." The mass of Earth dimples this fabric, much like a heavy person sitting in the middle of a trampoline. Gravity, says Einstein, is simply the motion of objects following the curvaceous lines of the dimple.

If Earth were stationary, that would be the end of the story. But Earth is not stationary. Our planet spins, and the spin should twist the dimple, slightly, pulling it around into a 4-dimensional swirl. This is what GP-B went to space in 2004 to check.

The idea behind the experiment is simple:

Put a spinning gyroscope into orbit around the Earth, with the spin axis pointed toward some distant star as a fixed reference point. Free from external forces, the gyroscope's axis should continue pointing at the star--forever. But if space is twisted, the direction of the gyroscope's axis should drift over time. By noting this change in direction relative to the star, the twists of space-time could be measured.

In practice, the experiment is tremendously difficult.


One of the super-spherical gyroscopes of Gravity Probe B.

The four gyroscopes in GP-B are the most perfect spheres ever made by humans. These ping pong-sized balls of fused quartz and silicon are 1.5 inches across and never vary from a perfect sphere by more than 40 atomic layers. If the gyroscopes weren't so spherical, their spin axes would wobble even without the effects of relativity.

According to calculations, the twisted space-time around Earth should cause the axes of the gyros to drift merely 0.041 arcseconds over a year. An arcsecond is 1/3600th of a degree. To measure this angle reasonably well, GP-B needed a fantastic precision of 0.0005 arcseconds. It's like measuring the thickness of a sheet of paper held edge-on 100 miles away.

"GP-B researchers had to invent whole new technologies to make this possible," notes Will.

They developed a "drag free" satellite that could brush against the outer layers of Earth's atmosphere without disturbing the gyros. They figured out how to keep Earth's magnetic field from penetrating the spacecraft. And they created a device to measure the spin of a gyro--without touching the gyro. More information about these technologies may be found in the Science@NASA story "A Pocket of Near-Perfection."

Pulling off the experiment was an exceptional challenge. But after a year of data-taking and nearly five years of analysis, the GP-B scientists appear to have done it.

"We measured a geodetic precession of 6.600 plus or minus 0.017 arcseconds and a frame dragging effect of 0.039 plus or minus 0.007 arcseconds," says Everitt.

For readers who are not experts in relativity: Geodetic precession is the amount of wobble caused by the static mass of the Earth (the dimple in spacetime) and the frame dragging effect is the amount of wobble caused by the spin of the Earth (the twist in spacetime). Both values are in precise accord with Einstein's predictions.

"In the opinion of the committee that I chair, this effort was truly heroic. We were just blown away," says Will.

The results of Gravity Probe B give physicists renewed confidence that the strange predictions of Einstein's theory are indeed correct, and that these predictions may be applied elsewhere. The type of spacetime vortex that exists around Earth is duplicated and magnified elsewhere in the cosmos--around massive neutron stars, black holes, and active galactic nuclei.

"If you tried to spin a gyroscope in the severely twisted space-time around a black hole," says Will, "it wouldn't just gently precess by a fraction of a degree. It would wobble crazily and possibly even flip over."

In binary black hole systems--that is, where one black hole orbits another black hole--the black holes themselves are spinning and thus behave like gyroscopes. Imagine a system of orbiting, spinning, wobbling, flipping black holes! That's the sort of thing general relativity predicts and which GP-B tells us can really be true.

The scientific legacy of GP-B isn't limited to general relativity. The project also touched the lives of hundreds of young scientists:

"Because it was based at a university many students were able to work on the project," says Everitt. "More than 86 PhD theses at Stanford plus 14 more at other Universities were granted to students working on GP-B. Several hundred undergraduates and 55 high-school students also participated, including astronaut Sally Ride and eventual Nobel Laureate Eric Cornell."

NASA funding for Gravity Probe B began in the fall of 1963. That means Everitt and some colleagues have been planning, promoting, building, operating, and analyzing data from the experiment for more than 47 years—truly, an epic effort.

What's next?

Everitt recalls some advice given to him by his thesis advisor and Nobel Laureate Patrick M.S. Blackett: "If you can't think of what physics to do next, invent some new technology, and it will lead to new physics."

"Well," says Everitt, "we invented 13 new technologies for Gravity Probe B. Who knows where they will take us?"

This epic might just be getting started, after all….
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Offline Rhino

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Re: NASA Announces Results of Epic Space-Time Experiment
« Reply #1 on: May 17, 2011, 09:20:37 am »
Cool stuff! Thanks for posting!

Offline George in N Az

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Re: NASA Announces Results of Epic Space-Time Experiment
« Reply #2 on: May 17, 2011, 09:37:41 am »
lets get some of thse silicon quartz round thingies and make em smaller and use em as ball bearings right here. Build a nice race for em and with the right lubricant say MOBIL 1 or lack there of, we will have a wheel that will spin for a long time. It won't be frictionless due to the earths gravity, but it would be cool. Ceramic bearing on roids and perfectly round.

Less friction - better gas mileage.
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Offline lt1

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Re: NASA Announces Results of Epic Space-Time Experiment
« Reply #3 on: May 17, 2011, 11:21:23 am »
Wonderful use of tax dollars.  Not.  It would be a great use of private funds, though.
Eyes, Brain, Hands.  Repeat.

Offline Conrad

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Re: NASA Announces Results of Epic Space-Time Experiment
« Reply #4 on: May 17, 2011, 11:24:02 am »
Wonderful use of tax dollars.  Not.  It would be a great use of private funds, though.

I'll see that your objections are passed along.
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Offline Cold Streak

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Re: NASA Announces Results of Epic Space-Time Experiment
« Reply #5 on: May 17, 2011, 12:23:13 pm »
Fantastic technology but we've got KIPASS!   ;)

Offline Rhino

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Re: NASA Announces Results of Epic Space-Time Experiment
« Reply #6 on: May 17, 2011, 01:20:30 pm »
Maybe NASA did develop KIPASS and it uses this technology to warp the space time continuum. Yea that's it! That's the ticket!

Offline Conrad

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Re: NASA Announces Results of Epic Space-Time Experiment
« Reply #7 on: May 17, 2011, 01:34:45 pm »
Maybe NASA did develop KIPASS and it uses this technology to warp the space time continuum. Yea that's it! That's the ticket!


There you go! It's a little more difficult to change the batteries in NASA's KIPASS fob though. Lot's of training involved.

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Offline CigarSki®

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Re: NASA Announces Results of Epic Space-Time Experiment
« Reply #8 on: May 17, 2011, 02:16:03 pm »
This might just explain global warming...err...climate change.
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Offline JetJock

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Re: NASA Announces Results of Epic Space-Time Experiment
« Reply #9 on: May 17, 2011, 02:42:58 pm »
Wonderful use of tax dollars.  Not.  It would be a great use of private funds, though.

Actually, it IS.

Most of the advances in science and ultimately products we use every day, begin with pure research of this type. Will it have some eventual payoff for you? Perhaps not, but it builds on a body of other research that does move our understanding of the world --- and how to manipulate it to our advantage, and perhaps ultimately keep mankind in existence --- another few steps ahead.

Those of you who bitch about this probably had ancestors complaining about that new-fangled thing called fire that the scientists (wizards or medicine men) of the time were trying to perfect so you could have cooked food and warmth.

This is how society advances. This is what civilization requires.


Offline Tactical_Mik

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Re: NASA Announces Results of Epic Space-Time Experiment
« Reply #10 on: May 17, 2011, 02:45:15 pm »
Proving the theory will only cease objections and could lead to technological advancements.  I think it's cool.  Just the spheres at 40 atomic layers variance is a feat.
T.S.R.

Offline VirginiaJim

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Re: NASA Announces Results of Epic Space-Time Experiment
« Reply #11 on: May 17, 2011, 03:19:59 pm »
Actually, it IS.

Most of the advances in science and ultimately products we use every day, begin with pure research of this type. Will it have some eventual payoff for you? Perhaps not, but it builds on a body of other research that does move our understanding of the world --- and how to manipulate it to our advantage, and perhaps ultimately keep mankind in existence --- another few steps ahead.

Those of you who bitch about this probably had ancestors complaining about that new-fangled thing called fire that the scientists (wizards or medicine men) of the time were trying to perfect so you could have cooked food and warmth.

This is how society advances. This is what civilization requires.

Let's try to keep this discussion civil please without referring to whose ancestors did what....   Thanks.
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Offline Two Skies

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Re: NASA Announces Results of Epic Space-Time Experiment
« Reply #12 on: May 17, 2011, 03:48:18 pm »
Let's try to keep this discussion civil please without referring to whose ancestors did what....   Thanks.


My ancestors made bigger fires than your ancestors!

http://www.google.com/search?q=viking+pillaging&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&hl=en&tab=wi&biw=1065&bih=636

Sorry, couldn't resist!
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Offline Rhino

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Re: NASA Announces Results of Epic Space-Time Experiment
« Reply #13 on: May 17, 2011, 03:52:19 pm »
I wonder is some of the shuttle launch delays were due to KIPASS failure and they didn't have a rock. ;D

Offline VirginiaJim

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Re: NASA Announces Results of Epic Space-Time Experiment
« Reply #14 on: May 17, 2011, 03:57:02 pm »
I think it was a touch more than that..
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