Finding:

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   Gravity Probe A

   Gravity Probe A (GP-A) was a space-based experiment to test Einstein's theory of general relativity performed jointly by the Smithsonian Astrophysical Observatory and the National Aeronautics and Space Administration.
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   Gravity Probe

   Gravity Probe A
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   Gravity Probe B

   Mission scientists view it as the second gravity experiment in space, following the successful launch of Gravity Probe A (GP-A) in 1976.
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   General relativity

   A precision measurement is the main aim of the Gravity Probe B mission, with the results expected in September 2008. ... ↑ Starting with the Hafele-Keating experiment, Hafele & Keating 1972a and Hafele & Keating 1972b, and culminating in the Gravity Probe A experiment; an overview of experiments can be found in Ohanian & Ruffini 1994, table 4.1 on p. 186.
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   Introduction to general relativity

   The related gravitational time dilation effect has been measured by transporting atomic clocks to altitudes of between tens and tens of thousands of kilometers (first by Hafele and Keating in 1971; most accurately to date by Gravity Probe A launched in 1976).
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   Timeline of gravitational physics and relativity

   1976 - Gravity Probe A experiment confirmed slowing the flow of time caused by gravity matching the predicted effects to an accuracy of about 70 parts per million. ... 2007 - End of Gravity Probe B experiment.
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   Tests of general relativity

   Other precision tests of general relativity, not discussed here, are the Gravity Probe A satellite, launched in 1976, which showed gravity and velocity affect the ability to synchronize the rates of clocks orbiting a central mass; the Hafele-Keating experiment, which used atomic clocks in circumnavigating aircraft to test general relativity and special relativity together; and the forthcoming Satellite Test of the Equivalence Principle.
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   Experimental physics

   Gravity Probe A
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   1976 in science

   June 18 - Gravity Probe A, a satellite-based experiment to test Albert Einstein's theory of general relativity, is launched.
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    List of unmanned spacecraft by program

    | Gravity program | Gravity Probe A - Gravity Probe B | ... Timeline · Probes (by status · timeline) · Interplanetary flights · Landings on other planets (objects left) · Objects at Lagrangian points

Explore the following pages on Powerset:

• Gravity Probe A,
• Gravity Probe,
• Gravity Probe B,
• General relativity,
• Introduction to general relativity,
• Timeline of gravitational physics and relativity,
• Tests of general relativity,
• Experimental physics,
• 1976 in science,
• List of unmanned spacecraft by program