Which of the following statements is true of the spectral sequence?
A) It is classified in groups labeled A through Q.
B) M stars are cooler and fainter than L dwarfs.
C) Y dwarfs are a class of objects with temperatures above 500 K.
D) O stars are the hottest, and M stars are the coolest.
D
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About how far is the Oort cloud from the Sun?
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