While nuclear power in Ohio is heading into the sunset, NASA Glenn in Cleveland has developed a portable nuclear energy system for outer space. In this Week’s Exploradio, WKSU’s Jeff St.Clair looks at how the system combines a new nuclear concept with a centuries-old mechanical engine. At the unveiling of the new Kilopower system , Jim Ryder, NASA’s head of space technology laid out why it’s needed. “When we go to the moon and eventually on to Mars we’re likely to need large power sources not