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Author Topic: MOVING SPACE  (Read 2759 times)

Offline ukmicky

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MOVING SPACE
« on: 29/06/2005 02:06:08 »
does space move?
I know around objects like black holes space becomes twisted and bent and so must move to some degree, but is it possible that the space as a whole could be flowing.


 

Offline gsmollin

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Re: MOVING SPACE
« Reply #1 on: 29/06/2005 04:26:26 »
Are you referring to the inertial frame dragging effect near a rotating body? There is a space mission going on right now called Gravity Probe B, that is trying to measure this effect quantitatively.
 

Offline DoctorBeaver

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Re: MOVING SPACE
« Reply #2 on: 29/06/2005 15:35:07 »
Against what would you measure the movement?
 

Offline gsmollin

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Re: MOVING SPACE
« Reply #3 on: 30/06/2005 20:23:54 »
You would measure it against an inertial frame of reference. A freely falling body is supposed to experience no gravitational forces. However, near a rotating mass, the inertial frame is dragged along with the rotation, and a freely falling body can measure the frame dragging.

Gravity probe B is doing that now. It is a remarkable experiment that has been under development for ~30 years! I first became aware of it in ~1984 when I was putting together a proposal for the spacecraft bus. This thing blew my mind. The spacecraft flies in an orbit around a set of rotating, superconducting, niobium spheres. The the spheres are freely floating inside the spacecraft, and the spacecraft keeps them there by adjusting its orbit around them. You have to read about this experiment. Here are some links:
http://einstein.stanford.edu/
http://einstein.stanford.edu/content/fact_sheet/GPB_FactSheet-0405.pdf
http://www.gravityprobeb.com/
http://books.nap.edu/html/gpb/summary.html
http://www.space.com/businesstechnology/technology/gravity_probe_b_031231.html
http://en.wikipedia.org/wiki/Gravity_Probe_B

« Last Edit: 30/06/2005 20:31:20 by gsmollin »
 

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Re: MOVING SPACE
« Reply #3 on: 30/06/2005 20:23:54 »

 

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