41. They just turn into a planetary nebula . 42. The Blue Snowball Nebula, a planetary nebula , is visible in a telescope as a blue circular object. 43. N . J . Martin described IC 289 as " A nice, faint round planet like planetary nebula . 44. This planetary nebula is of historical interest following its discovery by German-born English astronomer William Herschel in 1790. 45. Then, for a relative blink of about 1, 000 years or less, the star becomes a planetary nebula . 46. For a typical planetary nebula , about 10, 000 years passes between its formation and recombination of the star. 47. In planetary nebula NGC 6565, a cloud of gas was ejected from the star after strong stellar winds. 48. It was identified as a planetary nebula due to its strong radiation in the OIII ( oxygen ) bands. 49. NGC 6326, a planetary nebula with glowing wisps of outpouring gas that are lit up by a binary central star 50. V605 Aquilae is at the centre of a planetary nebula and is believed to be the source of the nebula.
