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

How large is the universe?

Answer 1

Alexander Acosta

Light hasn't had enough time to travel across the entire universe in almost 14 billion years due to its immense size.

We can never be certain of the universe's exact size because it is always expanding.

Phys.org/news/2015-10-big-universe.html is the link.

Sources: me and a paper on the universe by Dr. Luke Davies

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Answer 2

John Alexander

The observable universe is approximately 93 billion light-years in diameter, based on the current age of the universe and the speed of light. However, it's important to note that the actual size of the universe beyond the observable portion is not known.

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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.