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At longer wavelengths than the normal optical wavelengths to which human eyes are normally sensitive, is the radio part of the electromagnetic spectrum.
An exploration of a time when there were no stars or galaxies, and the universe was transparent - how were the first indications of the state of the universe in the dark ages discovered?
Well-trained eyes can be remarkably useful for capturing light curves of evolving objects in the cosmos, even contributing to modern research programmes.
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