Extraterrestrial Life and our World View at the Turn of the Millennium by Steven J. Dick
Dibner Library Lecture, May 2, 2000

Figure 23.
Planetary nebula designated NGC 3132 (the "Southern Ring" Nebula), representing cosmic evolution. These nebulae have nothing to do with planets, but are huge shells of gas formed after a dying star loses its outer layers, leaving behind a faint "white dwarf," seen here at the center next to a much brighter star in an earlier stage of stellar evolution. It is one of the closest nebulae, only 2000 light years distant.
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