sentences:  Pismis 24-1
  
  Pismis 24-1, also known as HD 319718, is the brightest star of the open cluster Pismis 24 within the nebula NGC 6357 about 6,500 light-years away.It was once thought to be the most massive star known, but is composed of at least three individual objects, each still among the most luminous and most massive stars known.