What did Murphy in Interstellar finally understand?

To put it simply, Murphy finally solved the old professor Brand's equation about gravity, thus successfully controlling gravity and allowing human beings on the earth to continue.

Scientists at NASA discovered gravity anomalies and gradually solved the mystery.

In interstellar space, plants and crops on the earth are on the verge of extinction because of the epidemic virus sweeping the world. Because of the loss of green plants, the oxygen on the earth is about to run out. Humans not only face food problems, but also face suffocation, and we must find ways to avoid extinction. At the same time, NASA scientists discovered many abnormal gravity situations. For example, scientists found a wormhole near Saturn. There may be habitable planets on the other side of the wormhole, but finding habitable planets can't save all mankind, because the technology at that time could not bring everyone on earth.

Through gravity anomaly, the old professor Brand realized that gravity might be controllable, so he began to study related theories. Later, NASA made two plans to save mankind. The first plan is to find a livable planet by controlling gravity, and all mankind can be moved to that planet. The second scheme is that if gravity can't be controlled, then human beings on the earth will have to fend for themselves, and these people who carry out exploration missions will take human fertilized eggs to other planets to reproduce.

Murphy's father sent data to let Murphy control gravity smoothly.

The main reason of gravity anomaly in interstellar space is the existence of wormholes near Saturn, which is basically impossible in four-dimensional space. Therefore, Professor Brandt speculated that it may be that the hyperbody of five-dimensional space-time passed through our cosmic magic, which led to the gravity anomaly. Professor Brandt invented this theory to describe gravity anomalies. After some research, he finally found that in order to solve the gravity equation completely, he must use the singularity data of the black hole and finally solve it successfully.

Murphy's father passed these data to Murphy through the gravity in the hyperbody. In the end, Murphy was able to successfully solve the gravity equation of the old professor Brand and know how to control gravity, so that human beings could get rid of the bondage of gravity and enter space, avoiding the end of extinction.

Gravity anomaly has caused a revolutionary discussion in physics.

In fact, in the real world, gravity anomaly really triggered a revolution in physics. For example, the trajectories of Mercury around the sun before and after are actually not coincident, and the perihelion will change.

This is called perihelion precession in physics, and the actual observed value of mercury perihelion precession is obviously greater than the predicted value of Newton's gravity theory. This problem used to be a difficult problem in physics, and it was not solved until Einstein put forward the general theory of relativity, and this abnormal phenomenon got a perfect answer.