Observable universe

Observing the universe is a spherical space centered around the observer, where objects emit light that can reach the observer's eyes. According to Hubble's Law, the universe is expanding, and the rate of regression of distant galaxies increases with increasing distance from Earth. That is to say, galaxies far enough away from Earth are moving at a speed exceeding the speed of light, and their emitted light will never reach our eyes. This distance is 46.5 billion light-years, which is also our observable radius of the universe.

The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.

The size of the universe is also a mystery that many people are confused about. As literary scholars speculate through observation today, the radius of our universe has reached 46.5 billion light years, with a diameter of 93 billion light years. If the Earth is the center, the observable universe can be viewed as a sphere, commonly known as the Hubble volume. All currently observable celestial bodies are located in a spherical spacetime with a radius of 46.5 billion light-years, known as the observable universe or Hubble volume. Beyond this range, although there are still galaxies, the light they emit will never reach Earth due to the universe's superluminal expansion.