Physics Asked by Zamicol on April 12, 2021
According to Einstein’s general relativity, massive bodies should cause gravitational redshift.
How accurately has this been measured?
A recent test (2018) using atomic clocks aboard two satellites found general relativity's gravitational redshift prediction to be accurate to $(+0.19 pm 2.48)times10^{-5}$.
This was not a planned experiment and the satellites had accidentally been delivered on elliptic rather than circular orbits in 2014. They were useless for their original purpose of navigation. Instead of taking a complete loss, the satellites were repurposed for experimentation.
Previously the most accurate measurement was taken in 1976 by Gravity Probe A which had an accuracy of 70 parts per million. The new test improves the accuracy by a factor of 5.6.
See the paper, "A gravitational redshift test using eccentric Galileo satellites".
Correct answer by Zamicol on April 12, 2021
Fifty years, ago, the Pound-Rebka experiment demonstrated gravitational blue shift on Earth in a tower at Harvard, to an accuracy of 10%.
Answered by m4r35n357 on April 12, 2021
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