SPECIAL ASTROPHYSICS SEMINAR
Speaker: Dr. C.W. Francis Everitt
W.W. Hansen Experimental Physics Laboratory,
Stanford University, Stanford, CA
Date: Tuesday, March 1, 2005
Time: 16:30 h (tea/coffee starts at 16:15 h)
Place: ETH Hönggerberg, HPF G6
Title: Gravity Probe B: Testing Einstein in Space –
A Marriage of Physics and Technology
Abstract:
The NASA-Stanford University Gravity Probe B (GP-B) mission was launched
from Vandenberg Air Force Base on 20 April, 2004. It will perform two
highly accurate tests of two effects in General Relativity, Einstein's
theory of gravitation, by means of orbiting gyroscopes: 1) the 6.6
arc-s/year geodetic effect due to the motion of the gyroscope through the
curved space-time around the Earth; 2) the 0.042 arc-s/year frame-dragging
effect due to the 'dragging around' of space and time by the rotating
Earth. After an extensive initial set-up and calibration, GP-B entered the
Science Data Collection Phase on August 27, with all parts of the
instruments operating successfully. In addition to describing the GP-B
science and the many new technologies developed for the experiment, an
account will be given of the real-life experience of setting up and
operating a scientific mission in space.