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What is the temperature at the point where the universe is expanding?

Answer 1

Very similar to the rest of the universe, I think, at 2.73 K (minus #270^@C#)

By definition, there is nothing outside of the universe (the word literally means "one thing"), so if the universe were expanding into something, one might assume there would be a shock wave or interface where temperatures might rise. However, in reality, space is expanding.

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Answer 2

Luke Allen

The cosmic microwave background radiation temperature—also known as the temperature of the expanding universe—is generally estimated to be approximately 2.7 Kelvin, or -270.45 degrees Celsius or -454.81 degrees Fahrenheit.

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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.