Planetary Nebulae represent the late stages of stellar evolution in which the outer layers of the star have been shed and are now being ionized by the core of the star which is destined to be come a white dwarf . ... Following are images of some famous and not-so-famous Planetary Nebulae. ... Abell 2 Narrowband Image Note that the outer structure is more well-defined here in the light of [O III] which is at a wavelength of 5007 Angstroms. ... The Bruce Balick Collection - Page I . ...