Which of the following best explains why we can rule out the idea that planets are usually formed by near-collisions between stars?
A) Studies of the trajectories of nearby stars relative to the Sun show that the Sun is not in danger of a near-collision with any of them.
B) Stellar near-collisions are far too rare to explain all the planets now known to orbit nearby stars.
C) A near collision might have created planets, but it could not have created moons, asteroids, or comets.
D) A near collision should have left a trail of gas extending out behind the Sun, and we see no evidence of such a trail.
Question 2
Which of the following are irregularities in our solar system that must be explainable in models of planetary formation?
A) Venus' low rate of rotation
B) Mars' north-south asymmetry
C) the tilt of Uranus' rotation axis
D) binary Kuiper Belt objects
E) All of the above
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