Planetary nebula are formed in the last phase of stellar evolution of sun-like stars.They are composed of gaseous and dusty materials which are expelled from geriatric stars just before the star dies. The Necklace Nebula is a ring-shaped planetary nebula found within the constellation of Sagitta nearly 15,000 light-years away and 5,000 years old. The ring of the nebula is about half a light-year across. A unique property of the Necklace Nebula is that is believed to be a binary star with an orbital period of just over a day.
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