Which of the four Galilean moons is not differentiated?
A) Io
B) Europa
C) Ganymede
D) Callisto
E) None of the above. All the moons are differentiated.
D
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An Earth satellite in an elliptical orbit has its smallest speed
A) closest to Earth. B) when getting farther from Earth. C) when farthest from Earth. D) need more information
Approximately how long did the era of nucleosynthesis last?
A) 10-10 second B) 0.001 second C) 5 seconds D) 5 minutes E) 5 years
Instructions: On occasion, the notation 
= [A, ?] will be a shorthand notation for 
.
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Exhibit 3-4
The diagram below shows the path taken by a sailboat tacking sideways because it cannot sail directly into the wind.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 3-4. The total displacement of the sailboat, the vector sum of its displacements OB, BC, CD and DE, is
A. 1732 m, East.
B. 2000 m, Northeast.
C. 6298 m, East.
D. 8000 m, Southeast.
E. 8000 m, East.
What do halo stars do differently from disk stars?
A) They orbit the galactic center with many different inclinations, while disk stars all orbit in nearly the same plane. B) Halo stars explode as supernovae much more frequently than disk stars. C) They remain stationary, quite unlike disk stars that orbit the galactic center. D) They orbit the center of the galaxy at much lower speeds than disk star.