臭氧是氧气与紫外线发生化学反应而产生的。
Ozone is produced by the reaction between oxygen and ultraviolet light.
有几种化学物质取代了氧气。
如果生命存在，科学家们希望这个行星上的光线能够嵌入大气层分子的化学指纹位移指示器，像氧气、甲烷一类的气体。
If life exists, scientists expect the planet's rays to be embedded with tell-tale chemical fingerprints of atmospheric molecules, such as oxygen and methane.
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