Astronomers can measure the diameter of our Milky Way Galaxy by plotting the position of globular star clusters.
Answer the following statement true (T) or false (F)
True
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How do a prominence and a flare differ?
A. A prominence is brief, bright eruption in the chromosphere; a flare is a tenuous flow of hydrogen and helium that sweeps across the Solar System. B. A prominence is a huge plume of glowing gas trapped in the Sun's magnetic field; a flare is a brief, bright eruption in the chromosphere. C. A prominence is a jet of hot gas thousands of kilometers long; a flare is an immense bubble of hot gas rising from deep within the Sun. D. There is no difference between a prominence and a flare.
Many scientists suspect that Venus has a stronger and thicker lithosphere than Earth. If this is true, which of the following could explain it?
A) the apparent lack of plate tectonics on Venus B) the slow rotation of Venus C) the high surface temperature that has "baked out" all the liquid water from Venus's crust and mantle D) the smaller size of Venus, which has allowed it to lose much more internal heat than Earth
Normal atmospheric pressure is
a. 14.7 psi. b. 1 N/m2. c. zero. d. 760 mm of mercury. e. 101,000 pascals. f. none of the above.
At the end of the first fifteen minutes, the mass ratio of H/He created was about:
A) 50/50. B) 75/25. C) 27/73. D) 90/10. E) 1/4.