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← ScienceWhich mechanism dictates spectral shifting near supermassive blackholes?
A)Gravitational redshift via spacetime curvature✓
B)Doppler shift from accretion disk
C)Cosmological expansion of local space
D)Thermal broadening of emitted frequency
💡 Explanation
Gravitational redshift occurs due to spacetime curvature near blackholes; photons lose energy climbing out affecting observed spectra. Light redshifts approaching a blackhole because energy and gravity oppose the photon's wavelength shift; therefore redshift, rather than other shifting means altering frequency signal.
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