Pismis 24-1

Pismis 24-1 (also known as HD 319718) is the brightest star in the Pismis 24 open cluster in the NGC 6357 nebula. It is 6,500 light years away. It was thought to be the most massive star known: actually it is made of three stars. These are still some of the most luminous and most massive stars known.
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Category:Stars