But they’re also just individual atoms. They’re not a chunk of radioactive material that can sit on your roof for years.
Besides, the whole ship would have maybe 15kg of fuel. That means that there can only be a maximum 15kg of fission products. It would burn fuel that for several years, spreading the exhaust out over the distance from here to Pluto and back.
Besides, the whole ship would have maybe 15kg of fuel. That means that there can only be a maximum 15kg of fission products. It would burn fuel that for several years, spreading the exhaust out over the distance from here to Pluto and back.