What is cosmic background radiation? Why is it significant?

Answer 1

The energy that exists in the void of space. It is significant because there is a lot of it.

Since the universe is mostly made up of empty space, or roughly 99.99999999999 (that's a lot of nines) 999999999999999999 %, the fact that the temperature of empty space is 3 degrees K indicates that there is more actual energy in the background of space than in the stars. The temperature of space is not absolute zero; it is almost 3 degrees K. That is a very small amount of heat, but it is not zero.

I'm pretty sure there are other explanations for this energy's existence, but apparently its existence supports the big bang theory.

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Answer 2

Owen Atkinson

Remaining thermal radiation from the Big Bang, or cosmic background radiation, helps map the large-scale structure of the universe and sheds light on the conditions of the early universe, thereby bolstering the Big Bang theory.

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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.