The Great Spirals, With Their Enormous Radial

Observation Always Involves Theory.

The Great Spirals... Apparently Lie Outside Our Stellar 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.

Observations Always Involve Theory.

Science Is The One Human Activity That Is Totally Progressive.