Why are the star clusters in tidal tails blue?
A) They are sad at being left behind.
B) The individual stars were red before the interaction, and an injection of new matter onto them turned them blue.
C) Blue stars are less massive and are therefore pulled away by tidal forces more easily.
D) Blue stars are more massive and therefore have greater inertia, so they stay in place while the rest of the galaxy keeps moving.
E) Blue stars in these newly active star-forming regions far outshine the less massive red stars.
Ans: E) Blue stars in these newly active star-forming regions far outshine the less massive red stars.
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Fill in the blank(s) with the appropriate word(s).
An experimenter surveyed one-half acre of a desert preserve and found three cactus wren nests. Assuming that the habitat is fairly uniform, how many nests would he expect to be in the entire 200-acre preserve?
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Quarks have electric charges of magnitude
a. e. b. 1/3 e. c. 2/3 e. d. 0. e. none of the above
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