“Every tiny faint color-spot is an entire galaxy, averaging two hundred billion stars each!”
Not trying to be clever, but I had the impression that some of the spots were clusters of galaxies. Or does Hubble have the power to resolve even those into their discreet galaxies?
Interesting point. Obviously there are several prominent galaxy clusters in the foreground. I clicked on the direct NASA link a while ago and then zoomed in as far as my browser would go, and by then I thought I was beginning to see individual pixels, so I may have been approaching the practical limits of magnification.
Some of those faintest glimmers no doubt were indeed clusters. I wasn't thinking about that at the time, but now that you've mentioned it I'll go back and look for them. But I'm quite sure you're correct.