observable universe
Astronomy
noun
The part of the entire universe that is (in principle) visible to an observer at a given time and place, i.e. that lies within the observer's particle horizon.
Origin
1930s; earliest use found in Science.
| 单词 | observable universe |
| 释义 | observable universeAstronomy noun The part of the entire universe that is (in principle) visible to an observer at a given time and place, i.e. that lies within the observer's particle horizon. Origin |
| 随便看 |
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