然而如果这颗行星处于很好的位置，天文学家会寻找三样关键的东西：水、空气和岩石。
However, if the planet is in a good position, astronomers look for three key things: water, air and rock.
随着那些宇宙粒子进入大气层，并且和空气，水，岩石或别的什么阻挡在他们飞行路径上的东西中的原子碰撞，它们就会触发其他粒子的级联反应。
As cosmic particles enter the atmosphere and bump into atoms of air, water, ice, rock or anything else that happens to stand in their way, they trigger telltale cascades of other particles.
空气中充斥着灰烬的味道，视线之内所有岩石和树木均被烧成焦黑色，地上散落着燃尽的碎骨，而这也正是他的家。
The air smelled of ash, every rock and tree in sight was scorched and blackened, the ground strewn with burned and broken bones, yet it had been home to him.
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