Observation Always Involves Theory.

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

Past Time Is Finite, Future Time Is Infinite.

Observation Always Involves Theory.

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

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