"From our home on Earth, we look out into the distances and strive to imagine the sort of world into which we were born. With increasing distance our knowledge fades until at the last dim horizon we search among ghostly errors for landmarks scarcely more substantial. The search will continue. The urge is older than history. It is not satisfied and it will not be suppressed."
— Edwin P. Hubble, 'Realm of the Nebulae,' 1936