Why Did the Temperature Start to Rise at the Center

question 45

Multiple Choice

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.

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