Because the universe has a finite age (~ 13.7 billion years) we can only see a finitedistance out into space: ~ 13.7 billion light years.
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。
2
To draw this boundary, physicists and mathematicians use a distorted length scale similar to escher 's, squeezing an infinite distance into a finite one.
为了画出这个边界，物理学家和数学家利用了类似于艾雪所用的扭曲尺度，将无穷大的距离压缩成有限的长度。
3
Its age, and the finite speed of light, means no astronomer can look beyond a distance of 13.7 billion light-years.