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Which mechanism causes higher energy readings from distant quasars?

A)Cosmological redshift stretches spacetime itself
B)Gravitational blueshift compresses wave frequency
C)Relativistic Doppler boosts observed luminosity
D)Interstellar extinction dims intrinsic brightness

💡 Explanation

Cosmological redshift stretches the wavelengths of photons during their journey because the expansion of space causes this effect in spacetime. Therefore, measured energy decreases relative to emission, rather than appearing 'higher' because of blueshift or extinction.

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