Why do scientists describe the theory of gravity as incomplete?
A) It does not incorporate a description of matter on a very small scale.
B) It does not explain why light bends near a dense object.
C) It does not agree with the expansion of the universe.
D) The gravity waves it predicts have not been observed.
E) It does not explain the effects on time from a massive object.
Question 2
Which of the following statements about the celestial sphere is not true?
A) The Earth is placed at the center of the celestial sphere.
B) When we look in the sky, the stars all appear to be located on the celestial sphere.
C) The celestial sphere is another name for our universe.
D) The celestial sphere does not exist physically.
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