Moon (and Earth) were given their momentum during the formation of the solar system. I'd say that's solar. And if you want to make a distinction about which st

Moon (and Earth) were given their momentum during the formation of the solar system. I'd say that's solar. And if you want to make a distinction about which star forged the heavy elements required for radioactive decay, then I'll agree it's 'stellar' energy not so much 'solar'.