Omega Centauri
Omega Centauri ( ω Cen , NGC 5139 , or Caldwell 80 ) is a globular cluster in the constellation of Centaurus that was first identified as a non-stellar object by Edmond Halley in 1677 . 
<triplet> Omega Centauri <subj> globular cluster <obj> instance of <subj> Centaurus <obj> constellation <subj> Edmond Halley <obj> discoverer or inventor