The view that the universe is virtual mainly comes from some theoretical and experimental results in modern physics, such as 1. Observer effect in quantum mechanics: Quantum mechanics holds that the essence of matter is wave-particle duality. When an observer observes a particle, it will affect the position and state of the particle. The observer's influence on the experimental results is called observer effect. 2. Parallel universe theory: The parallel universe theory holds that there are countless parallel worlds in the universe, and each world has similar or different physical laws and events. This theory has not been unanimously recognized by the scientific community, but it has become one of the important themes of science fiction works. 3. Black hole and information loss: According to the black hole theory, when matter enters a black hole, it will be compressed to infinite density, and then the information will disappear, which violates the law of information conservation in physics. Some scientists think this shows that the whole universe may be virtual. Although these theoretical and experimental results are controversial, they are all related to the concept of virtual universe, so some people think that the universe is virtual. However, it should be noted that this is only a hypothesis or speculation, and there is not enough evidence to prove or deny this view.