The fact that large elliptical galaxies are much more common in the central regions of galaxy clusters than elsewhere in the universe suggests that
A) collisions play a role in the formation of large elliptical galaxies.
B) spiral galaxies cannot form in galaxy clusters.
C) elliptical galaxies are older than spiral galaxies.
D) elliptical galaxies from the outer regions of clusters must migrate inward.
A) collisions play a role in the formation of large elliptical galaxies.
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Which type of feature is the best evidence of lunar volcanism?
A) Rays around the latest eruptions B) Craters all over the Moon C) Vents seen erupting in the mountainous highlands D) Rilles associated with lava flows accompanying the mare formation E) The Orientale Basin
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, along with their magnitudes. Determine the magnitude and direction of the vector given by 
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What will be an ideal response?
A nylon bar (E 5 2.1 GPa) with diameter 12 mm, length 4.5 m, and weight 5.6 N hangs vertically under its own weight. The elongation of the bar at its free end is approximately:
(A) 0.05 mm
(B) 0.07 mm
(C) 0.11 mm
(D) 0.17 mm
The largest asteroid, and probably the only one to be a spherical "world," is:
A) Eros. B) Ida. C) Vesta. D) Ceres. E) Gaspra.