The Plutonium Problem: Who Pays For Space Fuel? : NPR

The Plutonium Problem: Who Pays For Space Fuel? : NPR: NASA has relied on a special kind of fuel, called plutonium-238, to power robotic space missions for five decades. With supplies running low, scientists who want the government to make more are finding that it can sometimes seem easier to chart a course across the solar system than to navigate the budget process inside Washington, D.C.