The Temperature Began to Rise at the Center of the Solar

question 22

Multiple Choice

The temperature began to rise at the center of the solar nebula because

• A) the nebula was contracting and that fast-moving material collided and increased the thermal energy.
• B) supernova explosions were stirring up the material there and causing turbulence.
• 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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