The basic idea behind the planetesimal hypothesis is that
A. planets form as a direct result of the nuclear fusion of nebular gases and planetesimals.
B. planets form from the remains of super-giant planetesimals that undergo nuclear fission and blow apart, thereby creating smaller objectsthe planets.
C. early in the solar system's history, a star passed near to the Sun and pulled off gases that eventually condensed to form planets.
D. matter in a nebula experiences mutual gravitational attraction, and this results in the gradual accretion of larger and larger bodiesplanetesimals.
Answer:D
The basic idea behind the planetesimal hypothesis is that
A. planets form as a direct result of the nuclear fusion of nebular gases and planetesimals. B. planets form from the remains of super-giant planetesimals that undergo nuclear fission and blow apart, thereby creating smaller objectsthe planets. C. early in the solar system's history, a star passed near to the Sun and pulled off gases that eventually condensed to form planets. D. matter in a nebula experiences mutual gravitational attraction, and this results in the gradual accretion of larger and larger bodiesplanetesimals.