Changes

===Further Measurements near Sagittarius A*===

===Further Measurements near Sagittarius A*===

In July 2019, another star, S0-102, was characterized accurately by Andrea Ghez and her team.<ref>https://science.sciencemag.org/content/early/2019/07/24/science.aav8137</ref>  It is even closer to the Sagittarius A* black hole than S0-2.  Together, the two stars made it possible to map the gravity well in 3 dimensions, providing an even more accurate test of General Relativity.  "Making a measurement of such fundamental importance has required years of patient observing, enabled by state-of-the-art technology. Through their rigorous efforts, Ghez and her collaborators have produced a high-significance validation of Einstein's idea about strong gravity."  The statistical significance of these measurements is 5-sigma (5&sigma;).

In July 2019, another star, S0-102, was characterized accurately by Andrea Ghez and her team.<ref>https://science.sciencemag.org/content/early/2019/07/24/science.aav8137</ref>  It is even closer to the Sagittarius A* black hole than S0-2.  Together, the two stars made it possible to map the gravity well in 3 dimensions, providing an even more accurate test of General Relativity.  "Making a measurement of such fundamental importance has required years of patient observing, enabled by state-of-the-art technology. Through their rigorous efforts, Ghez and her collaborators have produced a high-significance validation of Einstein's idea about strong gravity."  The statistical significance of these measurements is 5-sigma (5&sigma;).  That means that the probability that this result came about by sheer chance is 1 in 3.5 million.  It is the commonly accepted criterion for definitive validations.

===Geodetic Precession===

===Geodetic Precession===