"Um, yes. We explained it away many times. You just can't wrap your huge brain around the concept.""there energy balls are like bombs that they could go off with there own will. Kamahamaha is controlled technique with the power to destroy a solor system. So, just imagine where he made it explode with an energy ball being empowered with enough Ki energy to destroy a solar system. "
This is the only thing that actually helped. Except for the bolded part,