▁SN   1 9 9 3 J , ▁while ▁another ▁example ▁is ▁Cass io pe ia ▁A . ▁The ▁II b ▁class ▁was ▁first ▁introduced ▁( as ▁a ▁theoretical ▁concept ) ▁by ▁Wo os ley ▁et ▁al . ▁in ▁ 1 9 8 7 , ▁and ▁the ▁class ▁was ▁soon ▁applied ▁to ▁SN   1 9 8 7 K ▁and ▁SN   1 9 9 3 J . ▁ ▁See ▁also ▁▁ ▁History ▁of ▁super n ova ▁observation ▁ ▁Super n ova ▁nucle os yn thesis ▁ ▁Super n ova ▁rem nant ▁ ▁References ▁ ▁External ▁links ▁List ▁of ▁all ▁known ▁Type ▁II ▁super nov ae ▁at ▁The ▁Open ▁Super n ova ▁Catalog . ▁▁▁▁▁ ▁Type ▁ 2 <0x0A> </s> ▁E UR id ▁v zw ▁( Europe an ▁Reg istry ▁for ▁Internet ▁Dom ains ) ▁is ▁the ▁non - pro fit ▁organisation ▁appointed ▁by ▁the ▁European ▁Commission ▁as ▁the ▁domain ▁name ▁registry ▁that ▁oper ates ▁the ▁. eu ▁top - level ▁domain ▁and ▁its ▁variants ▁in ▁other ▁scripts ▁- ▁. е ю ▁(. eu ▁in ▁C yr ill ic ) ▁as ▁of ▁ 1 ▁June ▁ 2 0 1 6 , ▁. ε υ ▁( in ▁Greek ) ▁as ▁of ▁ 1 4 ▁November ▁ 2 0 1 9 . ▁ ▁Est ab lished ▁in ▁Belg ium , ▁with ▁its ▁headquarters ▁located ▁in ▁Die gem , ▁E UR id ▁is ▁a ▁cons ort ium ▁of ▁two ▁European ▁cc T LD ▁operators : ▁DNS ▁Belg ium ▁(. be ) ▁and ▁I IT - CN