Which of the following phenomena is not associated with light retardation?

a. A measurement by the NASA Cassini spacecraft in 2003.
b. A measurement by the Viking spacecraft on Mars in 1976.
c. Light moving near a large object takes a longer path due to spacetime curvature.
d. Light reflected by mirrors left on the moon by astronauts.

c. light is bent near a massive object.

Physics & Space Science

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