One can always rely on some commenter on HN assuming that professionals in another industry don't know how to do their job properly and just need some random programmer to tell them how they should actually be doing things.

I happen to live and work near JPL. The astronomers there have none of the qualms you do about this image, because it turns out the professionals working on this image actually took such things you're complaining about into consideration when refining the data. And if you had read the publication accompanying this image, you would have known that.

Also, they weren't just looking for a glowing circle...That's a shockingly ignorant way to characterize their work.