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Old December 5th 17, 06:00 AM posted to sci.astro.amateur
RichA[_6_]
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Default Messier 76 - "Spirit of 76" - Red - White - and Blue

On Saturday, 18 November 2017 12:27:59 UTC-5, Razzmatazz wrote:
Just before winter sets in the outer arms of the Milky Way pass overhead. Embedded in them are regions of star formation and star death. M76 is a Planetary Nebula where the central star has shed its outer atmosphere shedding its hydrogen (the bright red areas) and oxygen (blue areas) into a shell, which is expanding into the surrounding space.

https://www.astromart.com/common/ima...7.jpg&caption=


Which colour for double-ionized oxygen is real? Most shots I've seen, it's been green, but it's blue here.