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How did scientists determine the size of the universe?

Answer 1

From the #estimates# of distances of the most distant objects. As of now, the most distant object is likely to be at 13.77 billion light years.. For size of our universe, this is doubled.

Photometric redshift estimates give approximations to the distances

of the most distant objects, in billion light year (Bly) units, .

The maximum is estimated as 13.77 billion light years. This is just the

distance between the farthest and the Earth.

Earth is not the center of our universe, but at the fringe..

So, there are reasons for the surmise that the center is away at

about 13.77 Bly.

At any instant, the Earth is in one of the infinite directions, from the

center.

So, the size is 2 X 13.77 Bly.

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Answer 2

Layla Anderson

In addition to using mathematical models of the universe's expansion, scientists estimate the size of the universe by measuring the distances to celestial objects using techniques like parallax, standard candles (like Type Ia supernovae), and redshift from the Doppler effect.

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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.