I have kind of a problem with superlatives when it to APOD (Astronomy Picture of the Day). About once a month or so I think "this is the most fabulous / incredible / magnificent image I've ever seen." Then next month rolls around.
So I won't say that this image of The Coma Cluster is the most magnificant, etc., image that I've ever seen. But it's certainly high on the list. Read the description/comment carefully, let the signficance of it all sink in. Try to count the little blue things. Then take a magnifying glass and see how many "little green smudges" you can see. Be sure to click on the image so you get the big one, then click on that to get the expanded view.
On second thought, I think this is the most fabulous / incredible / magnificent image I've ever seen.