47 Which of the following is one of the indirect approaches to detect a brown dwarf?
(A)To simply take a picture of it
(B)To compare its weight to a nearby star’s
(C)To see if a star nearby is quavered by the gravity of a dwarf
(D)To see if extra light is added to a dwarf by a certain bright star

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統計: A(18), B(52), C(110), D(50), E(0) #659797

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