Effect predicted by Albert Einstein spotted in a double-star system

[Admin]

Gravitational redshift, an effect predicted by Albert Einstein that is crucial for maintaining the Global Positioning System (GPS) on Earth, has been observed in a star system in our galaxy.

Effect predicted by Albert Einstein spotted in a double-star system : Read more

 

[rod]

Einstein GR predicts the gravitational redshift of light coming from the surface of a star. White Dwarf studies are used too. Sirius A and Sirius B is an excellent case study. 'The gravitational redshift of Sirius B', https://ui.adsabs.harvard.edu/abs/2018MNRAS.481.2361J/abstract, "...We measure a gravitational redshift of 80.65 ± 0.77 km s-1. From the measured gravitational redshift and the known radius, we find a mass of 1.017 ± 0.025 M☉ which is in agreement with the dynamical mass and the predictions of a C/O white dwarf mass-radius relation with a precision of 2.5 per cent."

The Sun's predicted redshift ~ 2.1E-6 wavelength redshift from rest wavelength at the surface. Unlike reports on the center of a black hole and what happens there, gravitational redshift has verification Okay, I checked my trusty Einstein book. "Thus a displacement towards the red ought to take place for spectral lines produced at the surface of stars as compared with the spectral lines of the same element produced at the surface of the earth,...For the sun, the displacement towards the red predicted by theory amounts to about two millionths of the wave-length...", Relativity The Special and the General Theory, A Clear Explanation that anyone can understand, 1961, p. 131.

 

[Helio]

Gravitational redshift has been measured in the past with light shinning downward from less than 100 feet above, IIRC.