Astronomers could gain only a biased idea of the universe when they were limited to the narrow wavelength band of visible rays . 由于只能在可见光的狭窄波段内观测，天文学家关于宇宙的概念显然只能是片面的。
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In the past few years , scientists have determined that this transparency ? critical for focusing light ? stems in large part from the unique ability of the lens to activate a self - destruct program in its cells that aborts just before completion , leaving empty but sustainable cells that transmit visible rays 过去几年，专家已确知聚光所必需的透明度，大部份源于水晶体细胞的独特能力，它们可在发育即将完成时启动自我摧毁程式，变成中空但能续存的细胞，好让可见光通过。
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