What form did the energy take before it was heat

Reference no: EM13556675

During the "heavy bombardment" period of our solar system astroids slammed into earth with large speeds thus resluting in earth becoming warmer. However, the astroids themselves where quite cold bc they where from the vacuum of space. Where did the heat come from to warm earth. What form did the energy take before it was heat?

Reference no: EM13556675

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