Isnt it an oxymoron to say that ‘scientists’ “UNDERSTAND” anything ?
The can only say what they can see, and then make guesses about what they cannot.
Best recent examples: 1. The atomic bomb may cause atoms other than the uranium or plutonium to explode ending the Earth. They weren't 100% sure of the chain reaction. It's in the original documents. 2. The Hadron Collider was also considered to become a massive new devastating disaster, according to some scientists. Luckily, those scientists were wrong again.
Most every new physics theory paper says, "could, would, may, possibly, potentially, etc.", until it's proven wrong by more "ifs, coulds, may be's, and on". This is why I question mathematicians and their equations and theoretical physicists. Applied physics is another matter. There are certain absolutes in physics such as certain Newton laws, but all brilliant mathematicians currently and in the near future will never explain how the singularity came into existence.
Also, doubt they will ever have observable empirical data what gravity is. They can do their math on white boards all life long, but still not explain what gravity is, nor how it was created, nor reproduce it, nor counter its force. Yes, they can calculate the effects of gravity on the size of the mass and the locality of other mass, but what is it?