Why Did the Solar Nebula Heat Up as It Collapsed

question 69

Multiple Choice

Why did the solar nebula heat up as it collapsed?

• A)Radiation from other nearby stars that had formed earlier heated the nebula.
• B)The shock wave from a nearby supernova heated the gas.
• C)Collisions among planetesimals generated friction and heat.
• D)Nuclear fusion occurring in the core of the protosun produced energy that heated the nebula.
• E)As the cloud shrank, its gravitational potential energy was converted to thermal energy.

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