The fact that nearly all galaxies are moving away from us, with more distant ones moving faster, helped us to conclude that:
a. The universe is expanding.
b. Galaxies repel each other like magnets.
c. Our galaxy lies near the center of the universe.
Ans: a. The universe is expanding.
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The inner planets are composed of rock and metal, and the outer planets are rich in low-density gases such as hydrogen and helium
a. True b. False Indicate whether the statement is true or false
A force of 120.0 N is applied to 2.000 cm diameter piston in a closed container of water with a density of 1,000 
The force on a piston with a diameter of 25.00 cm is
A. 18,750 N. B. 10,450 N. C. 9,500 N. D. 9,150 N. E. 8,450 N.
A graduate student in astronomy who grew up in Illinois gets to accompany her research professor to the South Pole Telescope. What will be different at the South Pole from the way she remembers the sky in Illinois?
What will be an ideal response?
When a beam of light that is traveling in air is reflected by a glass surface, there is
A) a 180° phase change in the reflected beam. B) a 45° phase change in the reflected beam. C) a 60° phase change in the reflected beam. D) no phase change in the reflected beam. E) a 90° phase change in the reflected beam.