What would you die of, if you were just floating in space?

i've seen this in a few movies (2001: a space odyssey; event horizon, sunshine) where the astronout gets disconnected from their ship. i've always wondered what would happen to them? in 2001..., the guy seems to die very quickly, but of what? in sunshine, the guy freezes almost immediately. how long would... show more i've seen this in a few movies (2001: a space odyssey; event horizon, sunshine) where the astronout gets disconnected from their ship. i've always wondered what would happen to them? in 2001..., the guy seems to die very quickly, but of what? in sunshine, the guy freezes almost immediately.
how long would you live and what would you eventually die of?
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