For 10 points, name this form of electromagnetic radiation with the shortest wavelength and highest energy.
In a knife-less procedure named for these objects, a patient wears a helmet with 201 small holes. These objects were discovered by Paul Villard, and they can turn white topaz into sky blue topaz. The phenomenon in which an atomic nucleus in a solid emits them without any recoil is called the Mossbauer effect. During the 1960s, the Vela satellites discovered their namesake bursts, which are the most luminous events in the universe. Isomeric transition results in the emission of these objects, which are responsible for the most penetrating form of radioactivity. For 10 points, name this form of electromagnetic radiation with the shortest wavelength and highest energy.
In a knife-less procedure named for these objects, a patient wears a helmet with 201 small holes.
gamma rays [or gamma (electromagnetic) radiation; prompt on "photons"]