Equipped with our five senses - along with telescopes and microscopes and mass spectrometers and seismographs and magnetometers and particle accelera….

We do not know why we are born into the world, but we can try to find out what sort of a world it is - at least in its physical aspects..

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

Past time is finite, future time is infinite..

The great spirals, with their enormous radial velocities and insensible proper motions, apparently lie outside our Solar system..

With increasing distance, our knowledge fades, and fades rapidly. Eventually, we reach the dim boundary-the utmost limits of our telescopes. There, w….

Observations always involve theory..

The outstanding feature, however, is the possibility that the velocity-distance relation may represent the de Sitter effect, and hence that numerical….

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

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

Astronomy is something like the ministry. No one should go into it without a call. I got that unmistakable call, and I know that even if I were secon….

A scientist naturally and inevitably ... mulls over the data and guesses at a solution. He proceeds to testing of the guess by new data-predicting th….

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

At the last dim horizon, we search among ghostly errors of observations for landmarks that are scarcely more substantial. The search will continue. T….

Science is the one human activity that is totally progressive..

The great spirals... apparently lie outside our stellar system..

The history of astronomy is a history of receding horizons..

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

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..

Observation always involves theory..