A starlike object seen on deep sky photographs coincides with an intense radio source and has a spectrum in which the characteristic Lyman pattern of hydrogen spectral lines has been shifted from the ultraviolet to the visible spectral range. What is this object?

Question

Quizplus · Accepted Answer

Quasars are highly luminous objects that were first identified through their strong radio emissions and have spectra showing large redshifts, indicating both their great distance and the expansion of the universe. This redshift can shift the Lyman series of hydrogen from the ultraviolet into the visible spectrum.

A Starlike Object Seen on Deep Sky Photographs Coincides with an Intense