That's what Einstein's theory of relativity says. He believes that gravity exists between two objects because gravity distorts four-dimensional space-time. The observation results of the solar eclipse in 19 19 confirmed that the mass of the sun bent the starlight. 1976, NASA's gravity exploration a project sent an atomic clock into space 10000 kilometers above the ground, which confirmed Einstein's conjecture that gravity would slow down time. Theoretically, the occurrence of space-time distortion can be verified by monitoring the position of the rotating shaft of the gyroscope orbiting the earth. After the reference constellation is determined, if the spatio-temporal distortion occurs, the directional relationship between the gyro axis and the reference constellation will change. According to Newton's mechanics principle, after the gyroscope is aligned with the reference constellation, it will always be aligned if there is no external interference. But according to Einstein's theory, the space-time distortion caused by the earth's rotation and gravity field will change the relative direction of gyroscope and reference constellation.