EDWIN POWELL HUBBLE

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

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

Past time is finite, future time is infinite.

Observations always involve theory.

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.

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

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

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.

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

The history of astronomy is a history of receding horizons.

We find them smaller and fainter, in constantly increasing numbers, and we know that we are reaching into space, farther and farther, until, with the faintest nebulae that can be detected with the greatest telescopes, we arrive at the frontier of the known universe.

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

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

Science is the one human activity that is totally progressive.

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

The outstanding feature, however, is the possibility that the velocity-distance relation may represent the de Sitter effect, and hence that numerical data may be introduced into discussions of the general curvature of space.

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

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.

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, 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.

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.

Observations always involve theory.

Past time is finite, future time is infinite.