Which of the Following Best Explains Why We Can Rule

question 23

Multiple Choice

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.

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