system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What would happen if you took off your helmet in space ?

Like i know you would die, but would it be an instant death or would u suffocate ?
gpt
You definitely wouldn't explode or anything dramatic like that. There have been a few astronauts who were exposed to vacuum or near vacuum and were successfully revived. IIRC less than 45s or a minute is survivable.