I do some amateur astrophotography and love the photos nasa produces and while looking at this one of Jupiter I noticed that, around its moon, the is a rectangle with a slightly blue tint and a bit more noise than the rest of the image.
So my question is:
What is the cause of this?
Would they be upping the brightness a bit just on the moon to make it pop more?
Would the brightness of the moon just cause this to happen around it? I don’t think this is the case considering it’s rectangular but I’m not sure.
This isn’t about nasa deniers by the way, I’m just genuinely curious and can’t find much on what exactly nasa does to their photos much less this specific one.
Thanks for the help guys, clear skys.