Space Itself Is Not Perfectly Cold, But Has A Background Temperature

Even in the vacuum of space, there's a faint glow of microwave radiation leftover from the Big Bang, known as the Cosmic Microwave Background (CMB). This omnipresent radiation gives the universe a baseline temperature of approximately 2.7 Kelvin, just above absolute zero, meaning it's never truly 'empty' of heat.

Source

https://en.wikipedia.org/wiki/Cosmic_microwave_background

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Published: March 29, 2026
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Cool Astronomy Cosmology Space Cosmic Microwave Background Cmb Big Bang Space Temperature Universe

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