Why did the temperature start to rise at the center of the solar nebula?
A) Supernova explosions were stirring up the material there and causing turbulence.
B) The nebula was contracting, which increased the speed of the atoms moving in it.
C) Fusion reactions were beginning in the core, releasing tremendous amounts of heat.
D) Massive stars nearby were heating the nebula with their ultraviolet radiation.

Question

Quizplus · Accepted Answer

As the solar nebula contracted due to gravity, the potential energy was converted into kinetic energy, increasing the speed of the atoms and thus raising the temperature at the center.

Why Did the Temperature Start to Rise at the Center