During a period of high solar activity, the corona
A) becomes smooth and even.
B) cools almost to the temperature of the photosphere.
C) disappears.
D) shrinks to half its normal size.
E) is more irregular.
E
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What force(s) are responsible for the collapse of an interstellar cloud?
a. nuclear b. gravity c. electric d. magnetic e. both c and d
How did Harlow Shapley determine where the center of the galaxy lies?
a. He plotted the distribution of open clusters. b. He plotted the distribution of globular clusters. c. He made star counts in every direction of the galactic disk. d. He measured the amount of dust obscuration in every direction of the galactic disk.
The definition of "life" requires only that an entity be able to reproduce itself
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