Astronomers could gain only a biased idea of the universe when they were limited to the narrow wavelength band of visiblerays.
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。
2
The extension of astronomy from visible light to radio waves to x-rays and gamma rays never failed to lead to the discovery of unusual objects such as radio galaxies, quasars, and pulsars.
从可见光扩展到无线电波，再到 X 射线和伽马射线，天文学总是会发现不寻常的物体，如射电星系、类星体和脉冲星。
3
Related cloaks have been made to work with infrared rays and visible light.