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... Apparently Lie Outside Our Stellar 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.

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

There We Measure Shadows, And We Search Among Ghostly Errors Of Measurement For Landmarks That Are Scarcely More Substantial.