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The finding that there were rock-melting temperatures on asteroids for sustained periods is puzzling: asteroids' heat source is unknown, and unlike planet-sized bodies, such small bodies quickly dissipate heat. Rubin suggests that asteroids' heat could have derived from collisions between asteroids. Skeptics have argued that a single impact would raise an asteroid's overall temperature very little and that asteroids would cool too quickly between impacts to accumulate much heat. However, these objections assumed that asteroids are dense, solid bodies. A recent discovery that asteroids are highly porous makes Rubin's hypothesis more plausible. When solid bodies collide, much debris is ejected, dissipating energy. Impacts on porous bodies generate less debris, so more energy goes into producing heat. Heat could be retained as debris fall back into impact craters, creating an insulating blanket.

The passage suggests that one factor that has made it difficult to account for the temperatures once reached by asteroids is

A.a miscalculation of the frequency of asteroid collisions
B.a misconception about asteroids' density
C.a mistaken assumption about what the heat source of the asteroids was
D.an underestimation of the rate at which small bodies lose heat
E.an erroneous view of how asteroids were formed

B显示答案

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