What task, undertaken alongside Milton Humason, was required after establishing galaxy distances to determine their movement?
Answer
Systematically measuring the redshifts for numerous galaxies via spectroscopy.
Once Hubble confirmed the vast distances to other stellar systems, the next logical step in charting cosmic motion involved measuring their velocities. This moved beyond simple positional astronomy and required diving into spectroscopy—the analysis of the light emitted by these distant objects. Working collaboratively, including with Milton Humason, Hubble focused on systematically measuring the redshift values exhibited in the light spectra from these galaxies. These measurements consistently pointed toward all observed galaxies moving away from Earth, leading directly to the formulation of the distance-velocity relationship.
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