The spectral lines of white dwarf stars are redshifted, because their high gravity reduces the energy carried by light escaping from the white dwarf.

Question

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The gravitational redshift occurs because the intense gravity of a white dwarf affects the light escaping from it, causing the light's wavelength to increase (shift towards the red end of the spectrum) as it loses energy.

The Spectral Lines of White Dwarf Stars Are Redshifted, Because