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Anyone else noticing the fairly common circularish structures in the top left of the image? It's like an uncanny number of stars are placed in circular arrangements. Is this due to some gravitational lensing effects around some of the objects in that area (some of which are visible)?

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I'm not sure I see what you're describing, but it's unlikely to be gravitational lensing. That requires truly massive gravitational fields and distances to have a noticable effect (eg. large clusters of galaxies).

It's probably more likely due to gravity causing stars/dust to drift towards each other, causing clumps and voids.

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