Protostars Are Difficult to Observe Because

question 136

Multiple Choice

Protostars are difficult to observe because

• A)the protostar stage is very short.
• B)they are surrounded by cocoons of gas and dust.
• C)they radiate mainly in the infrared.
• D)the protostar stage is very short, they are surrounded by cocoons of gas and dust, and they radiate mainly in the infrared.
• E)they are all so far away that the light hasn't reached us yet.

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