sentence2_structure: Radioactive atoms, nuclear explosions, and stars<>produce<>gamma rays
sentence1: In practise, any atomic explosion produces electromagnetic X-rays or gamma rays, particulate radiation (neutrons and electrons) and the radionucleides resulting from fission.
sentence2: Radioactive atoms, nuclear explosions, and stars produce gamma rays
question: Radioactive atoms, nuclear explosions, and stars produce what types of rays