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...
The nebulosity of M45, the Pleiades is apparently created by a cloud of interstellar dust , either left over from the birth of these young and hot stars, or the stars just happen to tra...