Which of the following is NOT a possible reason that Sirius was recorded as red between100 B.C. and 200 A.D., even though it is now seen as blue white?
A) Sirius A evolved from a red giant to a blue white star.
B) The companion white dwarf, Sirius B, was a bright red giant during those years.
C) There was a mistake made and propagated by scribes who copied the records.
D) There was a galactic dust cloud that passed between Sirius and us.
Correct Answer:
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