Hello from Kazakhstan. We can create an educational and practical device and practically master Einstein’s theories of relativity or obtain, for example, new physics: Postulate 1. Light is an ordered vibration of gravitational quanta. Postulate 2. The speed of light, regardless of the source, within the “framework of the dominant gravitational field” This is determined experimentally using a hybrid fiber optic gyroscope (based on Michelson's experiment 1881-2015). Using a hybrid fiber optic gyroscope, the straight-line speed of vehicles can be measured.
@@ericinema " NASA 網站 : Don't let the name fool you: a black hole is anything but empty space. Rather, it is a great amount of matter packed into a very small area - think of a star ten times more massive than the Sun squeezed into a sphere approximately the diameter of New York City. 十倍太陽質量被擠進紐約市直徑的球體. 質量不大, 只有十倍太陽. 但體積很小, 五萬分之一的距離, 黑洞表面引力很大 (不是質量太大). 但在太陽表面距離時, 引力已經很小了, 能偏折光線的角度大概不會到 "分" 吧.