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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Ellis, said his group decided to recommend to patients the removal of all leads with frayed wires visible on X-rays, even if they work.

WSJ: Agonizing Choices for Heart Patients

Its logo, an eye surrounded by dancing rays, is visible on T-shirts, bags, backpacks and scores of products targeted for young people up and down Jalan Malioboro, Jogjakarta's main business street.

CNN: Big Little Problems

It's said the process is similar to how a CT scan functions, but uses visible light instead of X-rays.

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