Science is the one human activity that is truly progressive. The body of positive knowledge is transmitted from generation to generation.

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

Equipped with our five senses - along with telescopes and microscopes and mass spectrometers and seismographs and magnetometers and particle accelerators and detectors sensitive to the entire electromagnetic spectrum - we explore the universe around us and call the adventure science.

Science is the one human activity that is truly progressive. The body of positive knowledge is transmitted from generation to generation.

I knew that even if I were second or third rate, it was astronomy that mattered.

Wisdom cannot be directly transmitted, and does not readily accumulate through the ages.

The history of astronomy is a history of receding horizons.