Observations Always Involve Theory.

The Great Spirals, With Their Enormous Radial Velocities And Insensible Proper Motions, Apparently Lie Outside Our Solar System.

Observation Always Involves Theory.

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.

Not Until The Empirical Resources Are Exhausted, Need We Pass On To The Dreamy Realms Of Speculation.

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.