由于宇宙有一个有限的年龄(约等于13.7亿年)，我们只能看到有限的空间：半径约等于13.7亿光年。
Because the universe has a finite age (~ 13.7 billion years) we can only see a finite distance out into space: ~ 13.7 billion light years.
和球类似，随着球的半径增长(正如宇宙膨胀)，球(宇宙)表面的任意点都以同样方式与其他点远离。
In the ball analogy, the radius of the ball grows as the universe expands, but all points on the surface of the ball (the universe) recede from each other in an identical fashion.
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