1. Also general relativistic effects due to gravitational redshift should become observable. 2. Gravitational redshift has been measured in the laboratory and using astronomical observations.3. It tested the gravitational redshift to 0.007 %. 4. Spatial local position invariance is tested using gravitational redshift measurements. 5. This implies in turn that metric theories all exhibit the gravitational redshift effect. 6. It usually applies in discussions of gravitational potential or related effects such as gravitational redshift . 7. Just as there is a difference between Doppler redshifts, and Cosmological and gravitational redshifts . 8. The gravitational redshift which he talks about happens even to objects falling into the hole. 9. The gravitational redshift is given by the square root of the time component of the metric. 10. The non-integrated Sachs Wolfe effect is caused by gravitational redshift occurring at the surface of last scattering.