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Which mechanism causes the Shapiro delay of radar signals near massive astrophysical objects?

A)Spacetime curvature affects light cones
B)Gravitational redshift increases bandwidth
C)Tidal forces compress photon spheres
D)Event horizon tidal locking reverses spin

💡 Explanation

The Shapiro delay occurs because spacetime curvature near massive objects increases the effective distance light travels. Gravity warps space, increasing path length; therefore the signal takes longer rather than changing intrinsic frequency of light itself.

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