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Theory of Relativity - Frame Dragging

 
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sikandarsiddiqi
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Joined: 26 Jan 2003
Posts: 294

PostPosted: Sun Oct 24, 2004 3:07 pm    Post subject: Theory of Relativity - Frame Dragging Reply with quote

SEFI offers you a whole new dimension for approaching issues of concern. Whenever you need quality inputs, the combined resource of SEFI members would be a useful sounding board - SEFI


Dear All,

Two scientists appear to have beaten a $600 million Nasa mission to be first to measure a phenomenon predicted by Einstein's theory of relativity.

"Frame-dragging" is the effect wherein a massive body like Earth drags space-time around with it as it spins.
Ignazio Ciufolini and Erricos Pavlis measured frame-dragging by studying the movements of two satellites in Earth orbit over a period of 11 years.
The results are published in the latest edition of the academic journal Nature.
In 1959, Leonard Schiff of Stanford University used Einstein's theory of general relativity to calculate that a gyroscope in polar orbit around Earth at 400 miles should go out of alignment by an angle of 42 milli-arcseconds per year.
One milli-arcsecond is one thousandth of one second of arc, which is itself a unit of an angle.
In April, Nasa launched Gravity Probe B, which carries precision gyroscopes to measure the effect on its one-year mission. The mission was first proposed in the 1960s, but financial and technical hitches delayed its launch until this year.
Ciufolini, from the University of Lecce, Italy, and Erricos Pavlis from the Joint Center for Earth Systems Technology in Baltimore, US, analysed millions of laser range-finding signals that are reflected by the satellites Lageos and Lageos 2.
These reflected signals are normally used to map variations in the Earth's gravitational field.
But the researchers analysed them for evidence that the satellites' orbits were altered by frame dragging, also known as the Lense-Thirring effect after the Austrian physicists who predicted it in 1918.
Ciufolini and Pavlis say their result is 99% of the value predicted by Einstein's theory, plus or minus 5%. This result has an uncertainty of about 10% say the scientists.
With best wishes to all.  
Engr.Sikandar Hayat Siddiqi
Dhaka - Bangladesh/Asia
Radio Link International E-mail


















          
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sps_1947
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 2

PostPosted: Mon Oct 25, 2004 5:38 am    Post subject: Theory of Relativity - Frame Dragging Reply with quote

sikandarsiddiqi@yahoo.com wrote:
SEFI offers you a whole new dimension for approaching issues of concern. Whenever you need quality inputs, the combined resource of SEFI members would be a useful sounding board - SEFI


Dear All,

Two scientists appear to have beaten a $600 million Nasa mission to be first to measure a phenomenon predicted by Einstein's theory of relativity.

"Frame-dragging" is the effect wherein a massive body like Earth drags space-time around with it as it spins.
Ignazio Ciufolini and Erricos Pavlis measured frame-dragging by studying the movements of two satellites in Earth orbit over a period of 11 years.
The results are published in the latest edition of the academic journal Nature.
In 1959, Leonard Schiff of Stanford University used Einstein's theory of general relativity to calculate that a gyroscope in polar orbit around Earth at 400 miles should go out of alignment by an angle of 42 milli-arcseconds per year.
One milli-arcsecond is one thousandth of one second of arc, which is itself a unit of an angle.
In April, Nasa launched Gravity Probe B, which carries precision gyroscopes to measure the effect on its one-year mission. The mission was first proposed in the 1960s, but financial and technical hitches delayed its launch until this year.
Ciufolini, from the University of Lecce, Italy, and Erricos Pavlis from the Joint Center for Earth Systems Technology in Baltimore, US, analysed millions of laser range-finding signals that are reflected by the satellites Lageos and Lageos 2.
These reflected signals are normally used to map variations in the Earth's gravitational field.
But the researchers analysed them for evidence that the satellites' orbits were altered by frame dragging, also known as the Lense-Thirring effect after the Austrian physicists who predicted it in 1918.
Ciufolini and Pavlis say their result is 99% of the value predicted by Einstein's theory, plus or minus 5%. This result has an uncertainty of about 10% say the scientists.
With best wishes to all.
Engr.Sikandar Hayat Siddiqi
Dhaka - Bangladesh/Asia
Radio Link International E-mail



















---------------------------------

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sikandarsiddiqi
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Joined: 26 Jan 2003
Posts: 294

PostPosted: Tue Oct 26, 2004 3:08 pm    Post subject: Theory of Relativity - Frame Dragging Reply with quote

Dear sps_1947@yahoo.com

I would like to inform you that your e-mail text  which you sent is not available in the monitor i.e missing, therefore, please SEND it again.

With best wishes.
Engr.Sikandar Hayat Siddiqi
Dhaka - Bangladesh/Asia
Radio Link International E-mail





sps_1947@yahoo.com wrote:


sikandarsiddiqi@yahoo.com wrote:
SEFI offers you a whole new dimension for approaching issues of concern. Whenever you need quality inputs, the combined resource of SEFI members would be a useful sounding board - SEFI


Dear All,

Two scientists appear to have beaten a $600 million Nasa mission to be first to measure a phenomenon predicted by Einstein's theory of relativity.

"Frame-dragging" is the effect wherein a massive body like Earth drags space-time around with it as it spins.
Ignazio Ciufolini and Erricos Pavlis measured frame-dragging by studying the movements of two satellites in Earth orbit over a period of 11 years.
The results are published in the latest edition of the academic journal Nature.
In 1959, Leonard Schiff of Stanford University used Einstein's theory of general relativity to calculate that a gyroscope in polar orbit around Earth at 400 miles should go out of alignment by an angle of 42 milli-arcseconds per year.
One milli-arcsecond is one thousandth of one second of arc, which is itself a unit of an angle.
In April, Nasa launched Gravity Probe B, which carries precision gyroscopes to measure the effect on its one-year mission. The mission was first proposed in the 1960s, but financial and technical hitches delayed its launch until this year.
Ciufolini, from the University of Lecce, Italy, and Erricos Pavlis from the Joint Center for Earth Systems Technology in Baltimore, US, analysed millions of laser range-finding signals that are reflected by the satellites Lageos and Lageos 2.
These reflected signals are normally used to map variations in the Earth's gravitational field.
But the researchers analysed them for evidence that the satellites' orbits were altered by frame dragging, also known as the Lense-Thirring effect after the Austrian physicists who predicted it in 1918.
Ciufolini and Pavlis say their result is 99% of the value predicted by Einstein's theory, plus or minus 5%. This result has an uncertainty of about 10% say the scientists.
With best wishes to all.
Engr.Sikandar Hayat Siddiqi
Dhaka - Bangladesh/Asia
Radio Link International E-mail



















---------------------------------

Y! Messenger - Communicate in real time. Download now.








---------------------------------











          
---------------------------------

Posted via Email
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View user's profile Send private message
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