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How big was the universe one second after the Big Bang?

Answer 1

#Radially, 1 light sec = 299792458 meters around the Big Bang nothingness.

My estimate is based on estimates from other sources. In 13.8 billion years, the universe has expanded by 13.8 billion light years.

I therefore have references to support my estimate.

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Answer 2

Christopher Ales

The universe was incredibly hot and dense a second after the Big Bang, with a diameter of roughly 10^9 kilometers and a temperature of roughly 10^10 Kelvin.

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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.