But Dr Koechlin does not worry about that, because his Fresnel telescope will be in space.

然而，凯什兰博士并不为此担心，因为他的菲涅尔望远镜将会在太空中。

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When Dr Koechlin and his team pointed 12 it at Mars they could distinguish that planet's two tiny moons-a task which would require a Newtonian telescope with a mirror at least 30cm across.

当凯什兰博士和他的团队观测火星时，他们可以分辨火星的两个微小卫星——这样的任务如果是利用牛顿的望远镜则需要一个直径最少长达30厘米的镜面。

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That, Dr Koechlin reckons, gives Fresnel optics a big advantage over Newtonian ones.

ECONOMIST: The search for alien life

When Dr Koechlin and his team pointed it at Mars they could distinguish that planet's two tiny moons a task which would require a Newtonian telescope with a mirror at least 30cm across.

ECONOMIST: The search for alien life