Question

where did the energy of the sun come from originally?

• thermal energy that was converted from the magnetic energy of the original nebula collapse
• ultraviolet energy that was converted from the magnetic energy of the original nebula collapse
• ultraviolet energy that was converted from the gravitational energy of the original nebula collapse
• thermal energy that was converted from the gravitational energy of the original nebula collapse

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Explanation:

The Sun formed from a collapsing nebula. During nebula collapse, gravitational energy is converted. The Sun's initial energy (before nuclear fusion dominated) came from gravitational energy of nebula collapse being converted to thermal energy (as the nebula contracted, gravitational potential energy turned to heat). The other options have incorrect energy types (ultraviolet) or incorrect energy source conversion (magnetic instead of gravitational).

Answer:

D. thermal energy that was converted from the gravitational energy of the original nebula collapse (assuming the last option is D; if options are labeled differently, adjust the label but the text is "thermal energy that was converted from the gravitational energy of the original nebula collapse")