The first true quadruple quasar system was discovered in 2015 at a redshift z = 2.0412 and has an overall physical scale of about 200 kpc (roughly 650,000 light-years).
The first true quadruple quasar system was discove,red in 2015 at a redshift z = 2.04?12 and has an overall p!hysical scale ?of? about 200 kpc (roughly 650,000 light-years).