dark ages
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Dark Ages:
see Middle AgesMiddle Ages,period in Western European history that followed the disintegration of the West Roman Empire in the 4th and 5th cent. and lasted into the 15th cent., i.e., into the period of the Renaissance.
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dark ages
The period between the recombination epoch and the formation of the first bright galaxies. Toward the end of this time the first generation of stars must have formed in protogalaxies, and created the first heavy elements. The absence of observable radiation renders this period ‘dark’. Only when sufficient stars or quasars have formed to reionize the intergalactic medium (as revealed by the Gunn–Peterson test) is this period observable.Collins Dictionary of Astronomy © Market House Books Ltd, 2006