Why will nuclear fission probably not be used directly for powering automobiles? How could it be used indirectly to power automobiles?
ANSWER: Already people have tried to power automobiles, but it was not very efficient. Efficient means in terms of the radioactive materials we have in the world is very less and we are not supposed to use them for such purpose. The ford company had already built a car which could work by nuclear fission but could not commercialise it. If we could do it, then we could have get rid of most of the problems related to energy and pollution. But the amount of availability of radioactive material is very less. So that will not be very effective idea. Secondly, to control the reaction in automobiles is a very tough and risky job. The portable nuclear reactors could explode if not kept with care. So there is a risk factor too. This is why they are not used to power automobiles.