Now, why care about severely manipulated or completely made-up sky pictures widely assumed to be real? Isn't space art yet another great way to convey the beauty of space? If labeled as such: of course it is! But the issue here is what Australian astronomy popularizer Ian Musgrave has termed "sky literacy": the ability to understand what's happening in the sky (and getting inoculated against severe misinterpretations of celestial happenings that others may shamelessly exploit). Unscientific fake images like the setting round Sun with the bizarrely brightened limb may seem only a small detail here (not recognizing Venus or other normal naked-eye sky phenomena is much more troubling), but we in the astronomy outreach community should behave responsibly on every level, shouldn't we? A 'borderline case' in this regard is a famous solar photographer who gets great H-Alpha images like this recent one - only to invert the greyscale on the disk but not of the prominences every time: a very confusing (and neither helpful nor IMHO aesthetic) process that has confused more than one professional astronomer desparately trying to understand what's going on - and leaves the broader audience in the dark, literally. Explaining narrow-band solar images is hard enough, but here a level of confusion is added without need.
The nonchalance with which many in the astronomy community are ignoring the issue of misleading space pictures on the web - let alone celebrating them - is disturbing, especially given the increasing awareness of image manipulation in real life and news media in particular. Here at least the professionals try to strive for the moral high ground: For example a manipulated - by NASA! - image from the Apollo 11 mission should be deleted, they say, from all image archives. Photojournalists have given themselves ethical guidelines, and not so infrequent scandals like a recent one in Austria with a 'spiced-up' photo from Syria underscore their necessity. The only astrophotographical organisation I know that has similar guidelines is The World at Night where all compositing is banned; unfortunately their - still developping - rules aren't online yet. Would it be too much to ask for astronomy outreach activists to at least try to stick to a similar standard, clearly labeling artwork as such? And, if available, always use genuine photographs of the sky of which there are so many outstanding ones around anyway.