Space Isn’t Actually Cold—The Terrifying Physics of the Cosmic Void | Space Documentary

Space is often described as unimaginably cold—but that explanation is incomplete. A vacuum has almost no particles to transfer heat, meaning space does not possess temperature in the same way that air, water or solid matter does.

Far from stars, objects can eventually approach the temperature of the cosmic microwave background: approximately 2.7 degrees above absolute zero. Yet direct sunlight can heat an exposed spacecraft surface to extreme temperatures while its shaded side simultaneously freezes.

So what would happen to an unprotected human body in space? Would you freeze instantly, boil or slowly lose heat through radiation?

This science documentary explores the physics of temperature in a vacuum, heat transfer, cosmic background radiation and why the true thermal environment of space is far stranger than most movies suggest.

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