From Wikipedia: "Omega Centauri ( 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...
Staring back at us from 650 light-years away, the Helix Nebula (NGC 7293) is one of the closest and most detailed planetary nebulae ever observed. Often called the "Eye of God", this co...