If we were to discover that there is no Deuterium in a very distant, young cosmic cloud of gas, what problem would that create for cosmologists?单项选择题
A
a. No problem at all!
B
b. Galaxy formation models depend heavily on the presence of D, as it helps the clouds from which galaxies formed to coalesce.
C
c. The Big Bang theory would be wrong, as it predicts the formation of D during the era of nucleosynthesis in the early Universe.
D
d. We would not have been here, as D is vital for life.
E
e. Fusion would never have started in the interiors of stars, since D is the first isotope to be participating in fusion reactions.
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