Question

What is infinity means
how long is infinity

Answer 1

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Infinity (∞) means that which doesn't have any end. It continues to extend.
For example, numbers are infinite.

We can't measure infinity. It is uncountable.

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Answer 2

Infinity (symbol: ∞) is a concept describing something without any bound or larger than any natural number. ... In mathematics, "infinity" is often treated as a number (i.e., it counts or measures things: "an infinite number of terms") but it is not the same sort of number as either a natural or a real number.