Why Did the Solar Nebula Heat Up as It Collapsed

question 47

Multiple Choice

Why did the solar nebula heat up as it collapsed?

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

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