Extraterrestrial waves are also called:

Explanation

Extraterrestrial or cosmic rays are protons and atomic nuclei moving at the speed of light, originating from outside our solar system. Gamma rays are a member of the electromagnetic spectrum. They are emitted from the radioactive decay of nuclei and have frequencies greater than the X-rays and wavelengths lesser than the X-rays. Beta particles, also known as beta rays, are high-speed, high-energy electrons (β-) or positrons (β+) emitted from the radioactive decay of an atomic nucleus. This process is called beta decay. Lastly, alpha rays, resembling a helium nucleus with two protons and two neutrons, are also emitted from the radioactive decay of an atomic nucleus.