Newton first discovered the gravity of the earth and put forward the law of universal gravitation, which contributed immeasurably to human civilization. It is true that we all know gravity, but few people think of anti-gravity.
This term has been mentioned as early as Einstein's theory of relativity, and it ranks fourth among the "eight challenges of the future of mankind" listed by Future Scientists. Today, the anti-gravity technology has been successfully broken through by the inventor in China, and the invention patent (891911) has been successfully obtained in the United States.
Anti-gravity technology is to obtain energy from gravity field and realize propellant-free driving. This invention is based on Einstein's prediction of gravitational waves. Gravitational wave is a gravitational field with waveform and finite speed propagation. Gravitational waves are related to the choice of coordinates. There may be energy in one reference frame, but there may be no energy in another reference frame.
If it is against gravity, it has existed since ancient times. Any force can be balanced with gravity (except the boundary of a black hole).
If it is to destroy the physical law of gravity and make something that is not governed by the law of gravity, it is a major discovery and rewrites the physical law. No matter Newton's theory of gravity or relativity, it is based on the fact that all substances with mass and energy are governed by the law of gravity, which is the basic physical law.