▁of ▁the ▁Mil ky ▁Way ▁( mass , ▁size ▁etc .) ▁ ▁glob ular ▁cluster ▁– ▁glob ular ▁clusters ▁within ▁the ▁Mil ky ▁Way ▁ ▁h alo ▁– ▁the ▁large ▁h alo ▁around ▁the ▁Mil ky ▁Way ▁ ▁kin emat ics ▁and ▁dynamics ▁– ▁the ▁mot ions ▁of ▁stars ▁and ▁clusters ▁ ▁nucle us ▁– ▁the ▁region ▁around ▁the ▁black ▁hole ▁at ▁the ▁center ▁of ▁the ▁Mil ky ▁Way ▁( S ag itt arius ▁A *) ▁ ▁open ▁clusters ▁and ▁associations ▁– ▁open ▁clusters ▁and ▁associations ▁of ▁stars ▁ ▁solar ▁neighbourhood ▁– ▁nearby ▁stars ▁ ▁stell ar ▁content ▁– ▁numbers ▁and ▁types ▁of ▁stars ▁in ▁the ▁Mil ky ▁Way ▁ ▁structure ▁– ▁the ▁structure ▁( sp iral ▁arms ▁etc .) ▁ ▁St ell ar ▁populations ▁▁ ▁Star ▁clusters ▁G lob ular ▁clusters ▁Open ▁clusters ▁ ▁Inter stell ar ▁medium ▁▁ ▁Inter plan et ary ▁space ▁- ▁Inter plan et ary ▁medium ▁- ▁inter plan et ary ▁dust ▁ ▁Inter stell ar ▁space ▁- ▁Inter stell ar ▁medium ▁- ▁inter stell ar ▁dust ▁ ▁Inter gal actic ▁space ▁- ▁Inter gal actic ▁medium ▁- ▁Inter gal actic ▁dust ▁ ▁See ▁also ▁▁▁ ▁Gal axy ▁ ▁Mil ky ▁Way ▁ ▁Ext rag al actic ▁astronom y ▁ ▁References ▁ ▁External ▁links ▁ ▁M apping ▁the ▁hydro gen ▁gas ▁in ▁the ▁Mil ky ▁Way ▁M apping ▁the ▁dust ▁in ▁the ▁centre ▁of ▁the ▁Mil ky ▁Way ▁▁▁ ▁Category : A stronom ical ▁sub - dis cipl ines <0x0A> </s> ▁The ▁J ub ile e ▁class ▁were