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gravitation |
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That becomes tricky because gravitational theory dictates that the altitude isn't measured relative to average sea level, but to the geoid, a hypothetical surface that approximates the shape and size of Earth. In this collaborative program, involving NIST, JPL, the University of Colorado, and the Harvard-Smithsonian Center for Astrophysics, a laser-cooled cesium clock will be put aboard the International Space Station in 2005 to perform certain tests on gravitational theory and to improve upon the realization of the second. Assumed to be black, the Egyptians are credited with achievements ranging from "experimental aeronautics" to "a possible understanding of quantum physics and gravitational theory. |
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