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The search for alien life 寻找外星生物 Twinkle, twinkle, little planet 闪烁吧，小行星 An undervalued optical trick may help to find lifein other solar systems 一个不被人重视的光学方法可能能帮助寻找其他太阳系的生命 MOST astronomical telescopes employ reflection to focus starlight. 大部分天文望远镜都是运用的焦点星光的反射原理。 A concave mirror creates an image from this light using a design pioneered in the 17thcentury, by Sir Isaac Newton. 早在17世纪，艾萨克牛顿就开创性的利用这个光，让凹透镜产生了一个图像。 Those telescopes that do not employ reflection use refraction. 那些不利用反射的望远镜利用的是折射。 They have a system of lenses, 他们有透镜系统。 an idea first used to look at the stars by Galileo. 利用透镜系统的想法最早是伽利略用来观测星星的。 But there is a third way to focus light. 但还存在第三种聚焦光源的方法。 A century and a half after Newton, andmore than two after Galileo, a Frenchman called Augustin-Jean Fresnel worked out that youcan do it using diffraction. | 
