I recall that in the last animated episode, maybe not syndicated in America, AstroBoy flew into the sun to deliver a stabilzing artifact. He was consumed. Tezuka drew a story where he was rescued and rebuilt, but was transported back in time to when robots were persecuted, and technology was not up to keeping him repaired and refueled. He saw man at his best -and worst -mostly the latter. Ochanomizu was struggling to design & build a functional robot brain ...

AstroBoy finally ran out of fuel and went dormant on a hillside, and reached the present only as a mass of rust & corrosion. He was never rebuilt ...

Caaper, in my fanfic, THE THIRD LIFE FORM, strives to prevent that final fate for AstroBoy and has given him hints on how to avoid it.