Edwin Powell Hubble

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

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 oppressed.

The history of astronomy is a history of receding horizons.

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.

There we measure shadows, and we search among ghostly errors of measurement for landmarks that are scarcely more substantial.

All nature is a vast symbolism: Every material fact has sheathed within it a spiritual truth.

Observations always involve theory.