Curious edge on ring shaped nebula?

https://www.legacysurvey.org//viewer/?ra=60.0952&dec=36.6684&layer=unwise-neo6&zoom=6

http://aladin.unistra.fr/AladinLite/?target=04%2000%2032.900%2B36%2033%2030.22&fov=2.95&survey=P%2FallWISE%2Fcolor

Weird looking, isn’t it?

The “Lip” Nebula :slight_smile:

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