In 1929, the American astronomer Hubble, based on an astronomical observation that "all nebulae are far away from each other, and the farther away they are, the faster they will leave", concluded that the entire universe is expanding, and the separation movement between galaxies is also part of the expansion, not due to any repulsive force.
- Chinese name
- Cosmic expansion theory
- Foreign name
- theory of universal expansion
- Presenter
- Hubble
- Proposed time
- 1929
