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I believe it is about 3 degrees Kelvin. That is minus 270 degrees Celsius. This is known as the Cosmic Microwave Background Radiation(CMB) . Pensias and Wilson, using a radio telescope won the Nobel Prize for this finding and it gives us the best evidence yet of the remaining warmth left over from the Big Bang 13.8 Billion years ago.

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15y ago
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5mo ago

In deep space, temperatures can be extremely cold, close to absolute zero (-273 degrees Celsius or -459 degrees Fahrenheit). This is because there is no atmosphere or matter to trap heat and create warmth. However, temperature can vary depending on proximity to stars or other heat sources.

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Q: How cold is it in deep space?
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