What are the dimensions of a typical dark nebula of gas and dust within which a star might form?
A) a few thousand M ? inside a diameter of about 10 pc, or about 30 ly
B) about 10 M ? inside a diameter of about 10 pc
C) 1 or 2 M ? inside a diameter of about 100 au, about the size of the solar system
D) a few thousand M ? inside about 1 au, Earth's orbit
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