And the star in the middle created both oval nebulae. It is known as the dragon’s egg. Its name is derived from its proximity to the nebula NGC6188, the “fighting dragons of the ara”. Once, it were actually three stars, two of which merged a few thousand years ago. The two remaining stars are hot, blue stars, about 40 times more massive than the sun. They are rare because so far only three such stars are known in our Milky Way and two in the Andromeda galaxy.
Dragon’s Egg Nebula – NGC 6164 and NGC 6165