The sun's electromagnetic radiation is produced by

-gravitational forces in space
-exchange of gases in space
-stationary charges and solar winds
-changing electric and magnetic fields

-Changing electric and magnetic fields

Explanation:

Electromagnetic forces from the sun are formed when electric charges change their potential energy.

This electromagnetic forces are produced at different wavelengths across across the EM spectrum.

The sun also emits x-rays during solar flares.

The absorbed energy causes one or more electrons to change their location and get replaced by absorbed energy.

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