Home > Astronomy > Scale of Earth, Sun, Galaxy, and Universe

How vast is the universe?

Answer 1

We have no way of knowing because, as far as we can see, it stretches beyond the limits of what we can measure.

It is highly improbable that humans will be able to create instruments capable of measuring infinity, so our best estimate is that it is infinitely large.

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Answer 2

Ivy Allen

The observable universe is estimated to be about 93 billion light-years in diameter. However, the actual size of the entire universe is unknown and could be much larger.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.