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

How big is the universe and how old?

Answer 1

46.5 billion light-years big
13.8 billion light-years old

The universe is estimated to be 13.8 billion years old based on current data.

The observable universe's edge is roughly 46.5 billion light-years away.

The universe is expanding, which explains why, despite the fact that light has only been traveling for 13.8 billion years, it is currently 46 billion light-years from where it originated to where we are.

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Answer 2

Olivia Aldridge

The size of the universe is not precisely known, but it is estimated to be at least 93 billion light-years in diameter. The age of the universe is approximately 13.8 billion years, as determined by observations of the cosmic microwave background radiation and other cosmological data.

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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.