问答题 If a rock is large enough, the heat generated as it is thrown clear will be negligible except at its surface—where, if anything, melting may even produce an airtight skin to protect any microbes deeper down from the unpleasant vacuum of space.

【正确答案】如果岩石足够大的话，它被抛出去时产生的热量除了岩石表面上的以外是可以忽略不计的。岩石表面的熔化甚至可以产生一层密闭的“皮肤”，把藏在深处的微生物保护起来，使其免受令其不适的太空真空状态的影响。
【答案解析】