“From our home on the Earth, we look out into the distances are strive to imagine the sort of world into which we are born.. But with increasing distance our knowledge fades, and fades rapidly, until at the last dim horizon we search among ghostly errors of observations for landmarks that are scarcely more substantial. The search will continue. The urge is older than history. It is not satisfied and it will not be suppressed.” –Edwin Hubble
The deeper we look out into the Universe, the farther back in time we look. Our largest, deepest surveys have shown us not only galaxies in the very distant Universe, but teach us what they looked like when it was much younger, as well as how clustering — due mostly to dark matter — has evolved.
The Extended Groth Strip, pictured above, takes up just a sixth of a square degree on the sky, but contains over 50,000 galaxies, giving us a literal treasure trove of riches about the Universe.