How Can Space Be So Cold If the Stars are So Hot?

The Sun burns at 15 million degrees. The space between you and it is colder than liquid nitrogen. How?

Radiation heats what it touches. Not the vacuum it passes through. The Sun's light crosses 150 million kilometers in 8 minutes without warming that space by a single degree. The void stays at 2.7 Kelvin - the temperature left over from the Big Bang itself.

That cold isn't the absence of the Sun's warmth. It's the condition that makes the Sun's warmth useful. Without a cold sink there is no thermodynamic engine. Without a thermodynamic engine there is no weather, no ocean currents, no biology, no you.

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Видео How Can Space Be So Cold If the Stars are So Hot? канала The Mechanics of Rest