TOEFL Listening: ETS-TOEFL听力机经 - SB1QXJHN9C5B513VP$

What does the professor mainly discuss? A. The discovery of an Earth-like planet orbiting a distant star. B. A recent study of pulsars that confirms a theory about white dwarfs. C. The possibility of locating a habitable planet in an unexpected location. D. New date regarding the life cycles of stars.