Nuclear Power Is the Only Way to Power a Spacecraft

Pioneer ten was the furthest object from humanity for a long time. More recently, we sent voyager one, which was launched in 77,. So it's now the furthestobject from humanity, even though it left later. How else could you power this thing? Solar panels wouldn't be effective. After decades, when you're so far from the sun that it just looks like another star. Nuclear power is the only way to power these very, very long lived spacecraft.