The formation of one of the following phenomena requires that a young hot star (T =25,000 K) be relatively close by.Which one?
A) emission nebulae
B) HI regions
C) molecular clouds
D) 21-centimetre radiation
Correct Answer:
Verified
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Q32: How can molecular clouds be observed?
A)by using
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A)reflection nebulae
B)dense molecular clouds
C)HII
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