I know I had seen this link here before, and it is most likely a repost, but I think the most important image ever taken was not the uncomprehendable knowledge that the universe is HUGE beyond imagination, but that what makes up everything in that space is made up of tiny particles known as atoms. As fantastic the thought that the universe is so expanse that it boggles scientific understanding, what is even more astounding is that what comprises the everything also creates the nothing; atoms.
That is why, in my opinion, the single greatest image ever taken was that of the first visibly seen atoms by scanning transmission electron microscopes in the late 1960s, which proved that atoms are the quintessential building blocks of all matter and space.
If you would allow, here I quote Richard Feynman's view on quantum theory from his
Lecture on Physics. He introduced it as such:
If, in some cataclysm, all of scientific knowledge were to be destroyed, and only one sentence passed on to the next generation of creatures, what statement would contain the most information in the fewest words? I believe it is... that all things are made of atoms-little particles that that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another. In that one sentence, you will see, there is an enormous amount of information about the world, if just a little imagination and thinking are applied.
Awesome. 