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Originally posted by Ned
"Gravitational Redshift
Another phenomenon predicted by Einstein's general theory of relativity is that light loses energy as it emerges from a gravitational field. When light loses energy, its wavelength becomes longer and the color of the light shifts toward the red end of the spectrum (thus called the "redshift").
Two key tests of the gravitational redshift are the Pound-Rebka Experiment and NASA's Gravity Probe A. In 1960, physicists Robert Pound and Glen Rebka were able to detect the redshift of high-energy gamma rays in an elevator shaft at Harvard University. They sent gamma rays up from the bottom of the shaft to a sensor 74 feet high. As the gamma rays climbed the 74 feet out of Earth's gravitational field, they lost a minuscule amount of energy (~ 2 parts in a trillion), which Pound and Rebka were able to detect. Their measurement agreed with Einstein's predictions to within 10%, later improved to about 2%.
A more precise test of the redshift was conducted by Gravity Probe A in 1976, a rocket-based experiment, also known as the Vessot-Levine test. In this experiment, a hydrogen-maser clock was launched to an altitude of 6,000 miles. The frequency of the clock in flight was compared to the frequency of a matching clock on the ground. The experiment revealed that the frequencies of the clocks differed slightly, matching Einstein's predictions to within 70 parts per million. "
http://www.spaceflightnow.com/delta/...417theory.html
"Gravitational Redshift
Another phenomenon predicted by Einstein's general theory of relativity is that light loses energy as it emerges from a gravitational field. When light loses energy, its wavelength becomes longer and the color of the light shifts toward the red end of the spectrum (thus called the "redshift").
Two key tests of the gravitational redshift are the Pound-Rebka Experiment and NASA's Gravity Probe A. In 1960, physicists Robert Pound and Glen Rebka were able to detect the redshift of high-energy gamma rays in an elevator shaft at Harvard University. They sent gamma rays up from the bottom of the shaft to a sensor 74 feet high. As the gamma rays climbed the 74 feet out of Earth's gravitational field, they lost a minuscule amount of energy (~ 2 parts in a trillion), which Pound and Rebka were able to detect. Their measurement agreed with Einstein's predictions to within 10%, later improved to about 2%.
A more precise test of the redshift was conducted by Gravity Probe A in 1976, a rocket-based experiment, also known as the Vessot-Levine test. In this experiment, a hydrogen-maser clock was launched to an altitude of 6,000 miles. The frequency of the clock in flight was compared to the frequency of a matching clock on the ground. The experiment revealed that the frequencies of the clocks differed slightly, matching Einstein's predictions to within 70 parts per million. "
http://www.spaceflightnow.com/delta/...417theory.html
Light "falling" deeper into a gravitational well gains energy and is blueshifted. Light "rising" out of a gravitational well is redshifted.
Why do you bother attempting to postulate or defend wacko theories of cosmology if you don't even understand basic physics?
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