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← ScienceWhich phenomenon causes apparent galactic redshift through expanding spacetime?
A)Cosmological redshift via spacetime expansion✓
B)Gravitational lensing of distant sources
C)Doppler shift from relative motion
D)Tidal forces distorting emitted wavelengths
💡 Explanation
Galactic redshift appears because the Expansion of the Universe causes Cosmological Redshift. As space expands, the wavelength of photons stretches along with it, therefore the photons lose energy and shift towards the red end of the spectrum, rather than actual local motion.
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