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The multidisciplinary field dedicated to figuring out how to leave [the planet] without exploding, burning up, suffocating, or any combination of the above. It combines physics (thrust, trajectory), chemistry (fuel that doesn't blow up too soon), biology (keeping humans alive in a metal can), and [psychology] (keeping those humans from murdering each other in said can). Spaceflight sciences have mastered the art of launching multi-billion-dollar equipment into the void, where it either works perfectly or becomes very expensive space junk. The field's greatest achievement is making the [impossible] merely extremely difficult.
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