Past time is finite, future time is infinite.

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.

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

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

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

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 the consequences of the guess and then dispassionately inquiring whether or not the predictions are verified.

Past time is finite, future time is infinite.