TOEFL Listening: ETS-TOEFL听力机经 - Q11E3S53HX0Z0484P$

Why does the professor discuss how stars originate? A. To explain how brown dwarfs begin to form B. To suggest that brown dwarfs do not originate in molecular clouds C. To explain why brown dwarfs emit light for billions of years D. To show that stellar embryos cause turbulence within molecular clouds