科学新发现：我们的大气层 Naked Science: Our Atmosphere认领

We couldn't survive without it - and in this episode, Naked Science reveals the scientific marvel of the Earth's unique and complex atmosphere. A precariously thin but vital blanket of air, see how a chance interplanetary collision and a remarkable plant mutation created the only planet in the solar system with an atmosphere rich in oxygen - the potent gas that powers our plane...