Math CentralQuandaries & Queries


Question from Peter:

The diameter of the observable universe is calculated to be 92 billion light years. What would that distance be in miles given a light year is 6 trillion miles?

Hi Peter,

92 billion is 92 followed by 9 zeros. 6 trillion is 6 followed by 12 zeros. Hence 92 billion times 6 trillion is $92 \times 6$ followed by $9 + 12 = 21$ zeros. If you want a name for the number 1 followed by 21 zeros I suggest you look at

You might also look at and


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