What is the actual size of the universe?

Answer 1

In my opinion, "#the# universe' is undefined. #Our# universe is 'observable universe'. Consensus is awaited.

There are approximations for 2 or 3 significant digits to the size of our galaxy Milky Way (MW). MW might be like an #elongated# oblate spheroid, with axes nearly 6.5 E+04 light years across and some thousands of light years bulge, at its Black Hole center. MW comprises billions of stars. There are similar (larger/smaller) galaxies around MW that are studied, using ever-updating technology. As of now, an affirmative answer on your question is yet to come. Also, consensus on multi-universe and parallel-universe theories are awaited..

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Answer 2

Christopher Ales

The observable universe, or the portion of the universe that humans can observe, has a diameter of roughly 93 billion light-years, but the actual size of the universe is currently unknown. It is thought to be infinite.

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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.