... ESA , NASA Explanation: The bright clusters and nebulae of planet Earth's night sky are often named for flowers or insects , and NGC 6302 is no exception. With an estimated surface temperature of about 250,000 degrees C, the central star of this particular planetary nebula is exceptionally hot though -- shinning brightly in ultraviolet light but hidden from direct view by a dense torus of dust. ... Publications with keywords: planetary nebula - emission nebula . ... Emission Nebula IC 1396 . ...