For which of the following is the celestial sphere an accurate representation of reality?
A. the view of the stars from Earth
B. the motion of the planets around Earth
C. the spherical bubble that surrounds Earth
D. the distance to the stars
E. the motion of the Sun around Earth
Answer: A
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A large stone is resting on the bottom of the swimming pool. The normal force of the bottom of the pool on the stone is equal to the:
a. weight of the stone. b. weight of the water displaced. c. sum of the weight of the stone and the weight of the displaced water. d. difference between the weight of the stone and the weight of the displaced water.
During the Mesozoic, the supercontinent of Gondwanaland fragmented into the continents of
A) North America, Europe, and Asia. B) South America, Africa, Antarctica/Australia, and India/Madagascar. C) North America, Europe, and Africa. D) South America, Africa, and Europe/Asia.
Where did the cosmic microwave background (CMB) come from?
a. photons emitted from the first stars b. photons released from hydrogen in our galaxy c. light scattered by dust in our Solar System d. photons released when electrons and nuclei combined for the first time
The number of stars in the Milky Way Galaxy is approximately ________
A) a few hundred million B) a few hundred billion C) a few hundred D) a few hundred thousand