Sphere in the dust

Could just be an error, but I see a strange circle in the diffuse area of this galaxy. Might delete later. Anybody else see it?

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Yep see it too

It shows up in single exposures. The word bubble comes to mind.

What do you think it could be? Ive even wondered if it was a shadow like a huge bat symbol from something bright like a quasar or galactic core. :man_shrugging: