[单项选择]Compared with their cosmologist(宇宙学家) colleagues, cosmogonists(星源学家) can sound a little old-fashioned. Edgar Allen Poe turned to the mysteries of cosmogony in an 1848 public lecture, just reprinted by Hesperus Press. And we encountered a reference to cosmogonists most recently in a new edition of Poe’s prose poem Eureka.
What’s the difference between cosmologists and cosmogonists Just two letters and a few billion light years. Cosmologists worry about where the Universe came from, cosmogonists with how the Solar System formed. The interesting thing is that one-and-a-half centuries after Poe, they still can’t reach agreement on what happened in the nearest 5 light years of space.
What’s the problem It turns out that there are a couple of competing explanations for why our neighbourhood is the shape it is, as well as several bizarre anomalies in the data. Cosmogonists know that the Solar System is essentially flat. With the exception of two tiny outliers, Mercury and Pluto, the
A. the Sun’s equator lies in the planetary plane
B. the Sun leans over because of loss of mass
C. the Sun and the planets have different origins
D. the Sun took shape somewhere in the Galaxy

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