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You know it. The Dark Rift. I feel like it is some kind of rip in the fabric of whatever is up there, like an entrance point for other energies from other 'places'.

Whatever it is, it looks bloody great with long exposure photography :)

I heard that is the 9th gate, the main entry point to this galaxy. Like a super highway. Also there is mythology of Celestial beings drinking from it and being guarded by a dragon/leviathan. I suppose is like the Celestial Nile river. It seems to be a main Celestial battle line as well. It's a seperation between the arms of the galaxy.