Fog or not?

Is this fog or a problem with the lens?

https://www.legacysurvey.org//viewer/?ra=336.8659&dec=6.6929&layer=hsc-dr2&zoom=12

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It is nicely visible in the Legacy Surveys DR9 layer also. This is called “Galactic cirrus” and is from dust in our Milky Way galaxy reflecting starlight.

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that’s actually a really cool find