Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.

Equipped with his five senses, man explores the universe around him and calls the adventure Science.

Observations always involve theory.

Past time is finite, future time is infinite.

With increasing distance, our knowledge fades, and fades rapidly. Eventually, we reach the dim boundary-the utmost limits of our telescopes. There, we measure shadows, and we search among ghostly errors of measurement for landmarks that are scarcely more substantial. The search will continue. Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.

The history of astronomy is a history of receding horizons.

Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.