单选题
Which of the following, if true, would most seriously undermine the validity of the model of star formation that is presented in the passage?
A、
A star is discovered that emits lower levels of trace ions than those discovered by x-rays of our galaxy's sun.
B、
A section of the universe is discovered to lack both stars and any sort of interstellar medium.
C、
A galaxy is discovered with a negative rate of star formation.
D、
In one corner of the galaxy, coronal gas is discovered to rarify as it becomes cooler.
E、
(E) A superbubble is found of equal mass to the galaxy surrounding it.
【正确答案】
D
【答案解析】
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