spectrum articles
What phenomenon results when spectral lines shift toward the red end because a galaxy is moving away?
What do the unique patterns of bright or dark lines in a spectrum represent for astronomers?
What systematic relationship did Hubble discover between a galaxy's redshift and its estimated distance?
What critical data point did Hubble seek by analyzing the spectral lines of distant targets?
How is Hubble's Law, linking recession velocity ($v$) and distance ($d$), mathematically expressed?
What does the cosmological interpretation of redshift imply about the expansion of the universe?
What profound concept about cosmic history is conceptually linked to the inverse of the Hubble Constant ($1/H_0$)?
What instrument attached to the telescope separated the light collected from spiral nebulae into its spectrum?
When an astronomical source is moving toward an observer, what spectral shift is observed?