The limited universe that humans have observed
Astronomers call the limited universe that humans have observed "visible universe" or "known universe". In literature, the "visible universe" is also called the real universe or plane.
- Chinese name
- Visible universe
- Alias
- Known universe
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The radius of the visible universe is about 14.3 billion Second gap About 46.6 billion light years. [1] Galaxy and Extragalactic galaxy They are all galaxies. Together, all galaxies form the largest celestial system. It includes all the celestial bodies in the universe as we know them. So far, human's ability to explore the universe is very limited. In this sense, the total galaxy is what astronomers call the visible universe. 
