NGC 5979, a planetary nebula in Triangulum Australe --- GC 5979 is a planetary nebula of a little over ⅔ of a light-year across, located some 11,700 light-years away from Earth in the southern constellation of Triangulum Australe (the Southern Triangle), while it is moving away from us at only about 23 kilometers per second.
The lovely, symmetric planetary nebula cataloged as MWP1 lies some 4,500 light-years away in the northern constellation Cygnus the Swan. spans about 15 light-years. Based on its expansion rate the nebula has an age of 150 thousand years, a cosmic blink in the 10 billion year life of a sun-like star. But planetary nebulae represent a very brief final phase in stellar evolution, as the nebula's central star shrugs off its outer layers to become a hot white dwarf.
NGC 6751 - This planetary nebula is estimated to be 0.8 light-years in diameter. 6,500 light-years away in the constellation Aquila, is the estimate of its distance. The star which collapsed several thousand years ago and threw off its outer layer of gas has an approximate surface temperature of 140,000 K