https://www.sciencenews.org/article/star-orbiting-black-hole-einstein-gravity-general-relativity In a paper published July 26, 2018 in Astronomy & Astrophysics, a team of researchers reports the observation of a hallmark of general relativity known as gravitational redshift.  The measurement is the first time general relativity has been confirmed in the region near a supermassive black hole. As light escapes a region with a strong gravitational […]