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Michael Mewhinney                                                                            March 31, 2004

NASA Ames Research Center, Moffett Field, Calif.                                       

Phone: 650/604-3937 or 650/604-9000

E-mail: Michael.Mewhinney@nasa.gov


NOTE TO EDITORS:  04-25AR

NASA TO DISCUSS GRAVITY PROBE B MISSION AT PRESS BRIEFING

NASA experts will discuss the Gravity Probe B (GP-B) launch, spacecraft and mission objectives during a televised news media briefing on Friday, April 2.

Originating from NASA Headquarters, Washington, D.C., the briefing will be held at 10 a.m. PST and will cover the origins, experimental methods, technology, mission operations and science of GP-B.  The mission will test two important predictions of Albert Einstein's general theory of relativity.  The 18-month mission is scheduled for launch on Saturday, April 17, 2004, at 10:09 a.m. PDT from Vandenberg Air Force Base, Calif.,  aboard a Boeing Delta II launch vehicle.

Reporters are invited to view the broadcast in the main auditorium at NASA Ames Research Center, Bldg. N-201, Moffett Field, Calif. News media representatives must present photo ID at the main gate, Moffett Field, to gain entry.

Briefing participants include:

-  Anne Kinney, director, Astronomy/Physics Division, NASA Headquarters

-  Rex Geveden, program manager, Gravity Probe B, and deputy director of NASA's Marshall Space Flight Center in Huntsville, Ala.

-  Francis Everitt, principal investigator, Gravity Probe B, Stanford University

- Brad Parkinson, co-principal investigator, Gravity Probe B, Stanford University

- Kip Thorne, Feynman professor of theoretical physics, California Institute of Technology, Pasadena, Calif.

The briefing will be carried live on NASA Television, with two-way question-and-answer capability for reporters at participating NASA centers. NASA TV is available on AMC-9, transponder 9C, C-Band, located at 85 degrees west longitude. The frequency is 3880.0 MHz. Polarization is vertical, and audio is monaural at 6.80 MHz

For more information about the Gravity Probe B mission on the Internet, visit:

http://einstein.stanford.edu

and

http://www.gravityprobeb.com.

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