Which of the following best explains why we can rule out the idea ...

[olgavictoria]

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

[yasmin]

Answer to Question 1

B

Answer to Question 2

E