1 Hour in a Vacuum — What Happens?

Hinzugefügt: 2026-05-19

[00:00:00]100 watts, that's how much heat your body pumps out right now. You're basically a walking space heater. What happens when there's nowhere for that heat to go? In a vacuum, there's no air to carry heat away from your skin. Your body loses heat only through radiation, dropping just 1 2 C per hour instead of instantly freezing. Space isn't cold, it's empty. Within 15 seconds, the moisture on your tongue and eyes starts to vaporize. Your saliva boils at 37 C in near zero pressure. That's exactly your body temperature. It's called ebullism. Dissolved nitrogen in your blood begins forming bubbles, exactly like a diver surfacing too fast. This is decompression sickness at full intensity, hitting every joint simultaneously at the 30-second mark.

[00:00:53]You stay conscious for roughly 9-11 seconds before oxygen deprivation blacks you out. NASA's 1965 vacuum chamber accident confirmed this.

[00:01:05]A technician survived after 27 seconds of accidental exposure. After one full hour, your skin is swollen, your blood gases are wrecked, but your core temperature has barely dropped. The vacuum is a perfect insulator. It won't freeze you.

[00:01:22]Right now, 100 watts of heat is radiating off your skin with nowhere to escape. Your body has been fighting entropy since the second you were born.

[00:01:32]The vacuum just makes the fight visible.