|This is an almost a perfect bubble of gas cast off by a single star
that has died. The bubble continues to expand; it is approximately
two light years across now. Its imperfection (from our perspective) is due
to photodisassociation (yes... this is a real word) by interstellar UV
radiation. Energetic photons from nearby bright stars
decompose the gas bubble. Note the dim central
blue star (a blue/white white dwarf).
|L R G B color production was used to create this image.||
Minimum credit line: Adam Block/NOAO/AURA/NSF
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