在牛顿利用星光的150年后,伽利略的透镜系统的两百多年后,一个名叫奥古斯丁让菲涅尔的法国人想到也可以利用衍射来达到目的。
A set of concentric rings, alternately transparent and opaque, will scatter and spreadlight waves in a manner that causes them to reinforce each other some distance away, andthus form an image. The rings are known as a zone plate.
一组兼有透明和不透明的同轴环可以分散和传播光波,并且在稍远的地方可以再使他们重新聚焦,由此形成一个图像。
And Fresnel s countryman, Laurent Koechlin, of the Midi-Pyrnes observatory, thinks zoneplates are the way to find out if there is life on other planets.
这些环被称作波带片。法国南比利牛斯天文台劳伦.凯什兰认为波带片可以用来寻找其他星球上是否存在生命。
Seeing oxygen in another planet s atmosphere would be a giveaway of biological activitybecause the gas is so reactive that it needs to be continuously renewed.
在其他星球的大气层发现氧气则表明这个星球上有生物活动,因为氧气是一种非常活跃的气体,所以他需要不停的更新。
That would almost certainly mean something akin to photosynthesis was going on,
而这也就基本上意味着星球上进行着某些类似于光合作用的活动,
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