Can unbreakable AI security’s auto-error correction be capable of fixing the twin paradox’s, time dilation and length contraction in a smart material’s chemical bonds, if such a relativistic propulsion driven spaceship is ever made of smart material?

Do you suppose that an artificially intelligent relativistic spacecraft propulsion driven spacecraft can prove the twin paradox or not?

What are the reasons for banning nuclear explosions in outer space, and therefore preventing humans to use nuclear spaceship propulsion?

What are the reasons for banning nuclear explosions in outer space, and therefore preventing humans to use nuclear spaceship propulsion?