Observations Always Involve 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.

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

The Outstanding Feature, However, Is The Possibility That The Velocity-distance Relation May Represent The De Sitter Effect, And Hence That Numerical Data May Be Introduced Into Discussions Of The General Curvature Of Space.

Observation Always Involves Theory.

I Knew That Even If I Were Second Or Third Rate, It Was Astronomy That Mattered.