===Anvendelse===
*[http://einstein.stanford.edu/content/story_of_gpb/gpbsty1.html Stanford: What is Gravity Probe B?] {{Webarchive|url=https://web.archive.org/web/20040811011127/http://einstein.stanford.edu/content/story_of_gpb/gpbsty1.html |date=11. august 2004 }}, [http://einstein.stanford.edu/content/story_of_gpb/gpbsty3.html The Geodetic Effect: Measuring the Curvature of Space-time] {{Webarchive|url=https://web.archive.org/web/20040817175219/http://einstein.stanford.edu/content/story_of_gpb/gpbsty3.html |date=17. august 2004 }} Citat: "... Third, most important, Gravity Probe B investigates the gravitational action of moving matter..."
**[http://www.sciencedaily.com/releases/2004/09/040908091101.htm 2004-09-09, Sciencedaily: NASA Gravity Probe B Mission Enters Science Phase, Ready To Test Einstein's Theory] {{Webarchive|url=https://web.archive.org/web/20041010143148/http://www.sciencedaily.com/releases/2004/09/040908091101.htm |date=10. oktober 2004 }} Citat: "...The magnetic field surrounding the gyros and SQUIDs (Super-conducting QUantum Interference Device) has been reduced to 10-7 gauss, less than one millionth of the Earth's magnetic field-the lowest ever achieved in space...The gyro readout measurements from the SQUID magnetometers have unprecedented precision, detecting fields to 10-13 gauss, less than one trillionth of the strength of Earth's magnetic field..."
Fysik Kemi