Protoplanets of the Jovian planets could have grown very hot from
A)heat from the Sun.
B)radioactivity of light elements such as hydrogen and helium.
C)the infall of material at high velocity.
D)tidal forces due to the Sun.
E)collisions with large planetesimals.

Question

Quizplus · Accepted Answer

The infall of material at high velocity during the formation of the protoplanets could have caused them to heat up. This is due to the conversion of gravitational potential energy into thermal energy, resulting in high temperatures.

Protoplanets of the Jovian Planets Could Have Grown Very Hot