We should expect galaxies to collide fairly often because
a. they are large with respect to their separation distances.
b. galaxies contain large amounts of neutral hydrogen.
c. galaxies occur in clusters.
d. a and c
e. none of the above
D
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Volcanism is more likely on a planet that
A) doesn't have an atmosphere or oceans. B) has high internal temperatures. C) is closer to the Sun. D) is struck often by meteors and solar system debris.
What is the cause of the lobes in a double-lobed radio galaxy?
What will be an ideal response?
The current drawn by a 1200-W toaster connected to 120 V is 10 A. The resistance of the toaster coils is
A) 6 ohms. B) 12 ohms. C) 18 ohms. D) none of the above
How is the sun situated in the universe?
A) The sun is an isolated star that is far outside of all the galaxies in the universe, and is thus not part of any galaxy. B) The sun is just one of a large number of stars, and is located on the fringes of the Milky Way galaxy, which itself is just one galaxy among many galaxies. C) The sun is just one of many stars, and is located near the center of the rest of the stars in the universe. D) The sun is at the center of the universe. E) Earth is at the center of the universe, and the sun orbits around the earth.