Q: Let me summarize it for you: What you mean is that if the mass of the sun is absolutely symmetrical around the center of mass, then the space around the sun will not have any curvature. If there are no other celestial bodies around except the earth. Then the Earth would not have an elliptical orbit, and the Earth would fall directly onto the Sun, right? Here are the answers from relativity experts: A: Quite right, if the mass of the Sun were absolutely symmetrical around the center of mass, then the space around the Sun would not have any curvature. If there were only the sun and the earth in the solar system, and there was no gravitational interference from other celestial bodies, the earth would move directly around the sun along a straight path and would not form an elliptical orbit. But it should be noted that this situation does not exist in the actual universe. Because there are a variety of celestial bodies in the solar system, including other planets, stars, etc., their gravitational interactions will cause planetary orbits to exhibit complex motion trajectories, such as elliptical orbits or other more complex motion trajectories. Are those who study the theory of relativity crazy?