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

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.

Observation always involves theory.

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

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

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 second-rate or third-rate, it was astronomy that mattered.