The universe has no center, which is a perplexing fact. While the Sun is the center of the solar system and the Milky Way has its own center, does the entire universe have a center? The answer is no. This is because the expansion of the universe occurs in four-dimensional space, not in three-dimensional space. Imagine an expanding balloon, where galaxies are like points on the surface of the balloon, and we live on these points. As the balloon expands, each point moves away from the others, and the farther the points are, the faster they recede. This phenomenon indicates that the so-called 'center' does not actually exist, as it is expanding in four-dimensional space.
To better understand this issue, we can liken the universe to a continuously expanding balloon. In this model, we can only observe and move on the two-dimensional surface of the balloon, unable to perceive changes in the three-dimensional space. Therefore, we cannot find a true center point, as this center point exists in three-dimensional space, while we can only sense its effects in two-dimensional space.
