Figure 11-23 RIVUXG Collage of Four Planetary Nebula These four planetary nebulae imaged by the Hubble Space Telescope are all roughly 7000 ly away. Planetary nebulae show a wide variety of shapes, indicative of the complex processes that occur at the end of stellar life. Henize 2-47 (top left) is dubbed the “starfish,” because of its six lobes of gas and dust, which were created by separate ejections of material occurring in different directions. IC 4593 (top right) displays a prominent pair of jets ending in red knots of glowing nitrogen gas. NGC 5307 (bottom left) displays a spiral pattern, which may have been caused by the dying star’s wobbling. NGC 5315, the chaotic-looking nebula at bottom right, reveals an X-shaped structure suggesting that the dying star ejected material in two different outbursts in two distinct directions.