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Gravity Probe B Wraps Up Observations.


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After 17 months of productive data collection, NASA's Gravity Probe B satellite has gathered all the data it needs to pronounce Einstein right or wrong. The probe was launched in April 2004, with four spherical gyroscopes designed to test two of Einstein's predictions about General Relativity: how the Earth's gravity warps space, and how its rotation drags space around with it. scientists will now spend about a year analyzing the data before presenting their conclusions.

Almost 90 years after Albert Einstein first postulated his general theory of relativity, scientists have finished collecting data to put it to a new, different kind of experimental test.

Gravity Probe B Satellite.
Artist illustration of the Gravity Probe B Satellite in orbit. Image credit: NASA/Stanford.

NASA's Gravity Probe B satellite has been orbiting the Earth for more than 17 months. It used four ultra-precise gyroscopes to generate the data required for this unprecedented test. Fifty weeks worth of data has been downloaded from the spacecraft and relayed to computers in the Mission Operations Center at Stanford University, Stanford, Calif. scientists have begun the painstaking task of data analysis and validation, which is expected to take approximately one year.

"This has been a tremendous mission for all of us," said Francis Everitt, Gravity Probe B principal investigator at Stanford. "With all the data gathered, we are proceeding deliberately to ensure everything is checked and re-checked. NASA and Stanford can be proud of what has been achieved so far."

Launched on April 20, 2004, from Vandenberg Air Force Base, Calif., Gravity Probe B has been using four spherical gyroscopes to precisely measure two extraordinary effects predicted by Einstein's theory. One is the geodetic effect, the amount by which the Earth warps the local spacetime in which it resides. The other, called frame-dragging, is the amount by which the rotating Earth drags local spacetime around with it.

"The completion of the GP-B mission is the culmination of years of hard work, training and preparation by the GP-B team," said Tony Lyons, NASA GP-B program manager from NASA’s Marshall Space Flight Center in Huntsville, Ala.

"We are proud to have been associated with this extremely significant mission," said Bob Schultz, Lockheed Martin's Gravity Probe B program manager. "Working with Stanford and NASA, we formed a powerful team to develop the challenging technologies needed to take a giant step forward in helping understand Einstein's theory of general relativity."

The Marshall manages the Gravity Probe B program. Stanford conceived the experiment and is NASA's prime contractor for the mission. Stanford was responsible for the design and integration of the science instruments and mission operations. The university has the lead for data analysis. Lockheed Martin Space Systems Company designed, integrated and tested the space vehicle and built some major payload components.

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