Silence is the first fiction. Inside a sealed cabin, air arrives with a bill: fans push it, pumps circulate it, and life-support hardware refuses to vanish into the background. The hum is not a flaw. It is proof of work. In orbit, comfort has a motor.The noise is a survival signal. It never sleeps. Ventilation fans drive forced convection across cabin surfaces, while pumps move coolant through a h...More