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RE: Can NASA pictures be considered real or they are just deceiving art?
jpg compression will not remove ray/radiation traces (although it can lower their resolution), these are just composites and purged images. You basically do it when you want to remove something what was there like wires and supportive scene or when you composite of generated 3D terrain and putting something other pictures there. Then you usually don't have generated atmosphere ray on the picture because it would cost you extra effort and it's not worth it.
I am pretty sure radiation traces would be removed in editing.
^This is just simply not true! Those "rectangular areas" don't mean anything, they are created when "blocks of pixels" are being mathematically reduced to compress the file size.
Well, I know what you mean. When you reduce quality really drastically you can achieve that effect. But frankly when you want to present something to others, is your goal to reduce quality so drastically or you want to provide as high detail level as possible? Unless you are hiding something you want always to produce highest possible detail level. Otherwise you could also produce reduced images like this one (in image below radiation was completely removed by data reduction, but also other details were).