According to Bill Bryson, the visible universe is a million million million million miles across.
That’s a 1 with 24 zeroes after it (1,000,000,000,000,000,000,000,000). That sounds rather large.
But the universe beyond what we can see is even harder to comprehend:
The number of light years to the edge of this larger, unseen universe would be written not “with ten zeroes, not even with a hundred, but with millions.” In short, there’s more space than you can imagine already without going to the trouble of trying to envision some additional beyond.
It hurts your head to think about this kind of thing.
How insignificant am I in relation to this vast universe?
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