Question

Which of the following describes a major role of gravity in star formation? A. Asteroids passing by a solar system are pulled in by planets' gravities to form a star at the center of the solar system. B. The gravitational forces of planets push gases from their atmospheres to form a star at the solar system's center. C. Gravity compresses gases at the center of a solar nebula until temperatures are high enough for nuclear fusion to occur. D. Gravity causes an interstellar cloud fragment to expand rapidly until it is large enough to form a star at its center.

Answer 1

D. Gravity causes an interstellar cloud fragment to expand rapidly until it is large enough to form a star at its center.