Which of the following is NOT predicted by general relativity?

Time passes at a faster rate aboard the International Space Station than here on the surface of the earth

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Light always travels in straight lines through space (or "space-time")

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Black holes exist

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The universe is expanding

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Planets and stars change the geometry of "space-time"

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Solution

The correct option is D Planets and stars change the geometry of "space-time"
General Relativity predicted the expansion of the universe.
General relativity also predicts (or at least allows for) the existence of black holes.
Light always travels a path called a geodesic which is a straight line in curved space-time but this path appears curvy at first. If this path is visualised in a flat space-time it would be perfectly straight.
The time expansion due to gravity ends up being larger than the time dilation due to centripetal force. So the clock ticks faster than the ground-based clock.

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