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The pressure issue would also make it impossible to hold air in your lungs, so you would pass out within a minute, but likely much sooner: "In 1965, while performing tests at the Johnson Space Center, a subject was accidentally exposed to a near vacuum (less than 1 psi) when his space suit leaked while in a vacuum chamber. Your tongue would be susceptible as well. Correction: The pressure is important: Your eyes, if left open, would basically boil and surface freeze because of lack of pressure on the liquid. In fact, if you were to float in sunlight you'd sooner cook than freeze. This is what makes a vacuum a good insulator. In a vacuum the only way to lose (or gain) body heat is through thermal radiation. You can play Half-Life in its original incarnation on Steam, or you can try Black Mesa, an acclaimed fan-made update/remaster that is truly a labor of love.People exposed to the vacuum of space do not freeze in a matter of seconds/minutes. Its graphics are quite dated by now, but the gameplay remains superb - particularly the tense encounters with enemy grunts who will take cover and even try to flank you.
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Half-Life's creative creature designs, superb enemy A.I., palpably atmospheric setting, and masterful pacing all combined to make it an instant classic, quite possibly the best FPS of all time. Overseeing the proceedings is a mysterious G-Man who bears a striking similarity to The X-Files's Cigarette Smoking Man, and whose presence adds a frisson of government paranoia to the experience. Before long, you're grappling with an invasion of hostile extraterrestrials - as well as soldiers whose job is to clean up the mess by eradicating anything that moves, friend or foe. You play Gordon Freeman, a mild-mannered nuclear physicist at the Black Mesa Research Facility who gets caught up in a teleportation experiment gone horribly awry. Instead of just dropping the player into monster-filled levels, Half-Life slowly introduced its situations with in-engine cutscenes, expository dialogue, and deliberate-yet-relentless pacing. Half-Life brought a new level of storytelling panache to the still-young FPS genre.
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