Figure 1 (IMAGE)

The University of Hong Kong

Figure 1

Caption

A now iconic collage from our group showing 22 individual well-known PNe, artistically arranged in a spiral pattern by order of approximate physical size. The largest PNe have a surface brightness about a hundred thousand times fainter than the smallest and can reach up to 3 pc across.

Credit

ESA/Hubble and NASA, ESO, NOAO/AURA/NSF

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