Question

what makes plutonium an ideal fuel source for spacecraft used for interplanetary exploration? it is the lightest element, making it easy to transport. it does not emit any radiation. it releases energy over a long period of time. it burns up quickly, providing a burst of energy.

Explanation:

Plutonium - 238 is used in radioisotope thermoelectric generators (RTGs) for spacecraft. It releases energy over a long time through radioactive decay, providing a reliable power source for long - duration interplanetary missions. It is not the lightest element, it emits radiation, and it does not burn up quickly to provide a burst of energy.

Answer:

It releases energy over a long period of time.