What relationship observed by Hubble strongly suggested that space itself was stretching?

Answer

The observation that the farther away a galaxy was, the faster it appeared to be receding, based on its redshift.

The realization that space was stretching came from comparing two key properties of distant galaxies: their measured distances and their observed redshifts. Redshift indicates that the light from these galaxies is stretched toward the red end of the spectrum because the source is moving away. Hubble observed a direct, quantifiable pattern: galaxies farther away from us displayed a greater redshift, meaning they were receding at a higher velocity. This proportionality—the farther away they were, the faster they moved—was the observational signature indicating that the expansion was intrinsic to space itself, not just objects moving through static space, analogous to dots on an inflating balloon.

What relationship observed by Hubble strongly suggested that space itself was stretching?

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