... 11.12.1998 . ... Their distances have been indirectly gauged by noting how much the light they emit has been stretched to longer wavelengths by the expansion of the Universe . ... What's the actual distance to quasars with Zs of 5 or so? ... about 15 billion light-years, give or take a few billion light-years depending on your favorite cosmology ! ... December 1998 . ... Publications with keywords: cosmology - quasar - redshift . Publications with words: cosmology - quasar - redshift . ...