空気が薄くなると、空気を伝わる音は当然小さくなります。また風（空気の流れ）を推進力として飛ぶプロペラ飛行機は飛べなくなります。空気が薄くなった世界で起こる様々な現象を見ることができます。 At high altitudes, where the air is very thin, the sounds traveling through it get quieter. Airplanes that use propellers to push themselves along through the air also become unable to fly. In this exhibit you’ll see some of the things that happen in very thin air.