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Which effect increases when observing astronomical objects near supermassive black holes?

A)Gravitational redshift of emitted light
B)Blue shift due to relative motion
C)Increase in apparent object luminosity
D)Decrease in observed spectral line width

💡 Explanation

The immense gravity near the black hole causes gravitational time dilation, because spacetime is highly curved in this region; therefore redshift increases, stretching the wavelength of emitted photons, rather than blueshift which compresses it under relative motion.

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