Some planetary nebula contain linear features within the nebula called filaments. We're not sure why these form. (Hubble image of PN IC 418)
@evilscientistca That is beautiful. It's amazing to think that this nebula is probably much bigger than the solar system.
@tsturm most PN are on the order of 1 ly across.
@evilscientistca Thanks for the size correction... that is quite a bit bigger than I thought. It looks awesome.
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