What event do astronomers think “cosmic background radiation” is left over from?

Answer 1

left over from the big bang.

The temperature was extremely high during the Big Bang, but as the universe expanded, it cooled down. Thirteen billion years later, the temperature is still 2.7 degrees Kelvin. This remnant of the Big Bang is known as cosmic microwave background radiation.

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Answer 2

Elena Antonova

According to astronomers, cosmic background radiation is the remnants of radiation from the Big Bang, which created the universe.

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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.