A particular star is found to have a very faint companion. When the spectrum of the companion is photographed and analyzed, it is found to contain absorption bands of the metal hydrides methane (CH4) and ammonia (NH3) , :but no water (H2O) . Based on this information, the companion is a brown dwarf of spectral class
A) K.
B) T.
C) M.
D) L.
Correct Answer:
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