Q. Who discovered Cosmic Rays?
Answer: Robert Millikan
Notes: The term "cosmic rays" was coined by the Austrian physicist Victor Francis Hess in 1912. Hess was awarded the Nobel Prize in Physics in 1936 for his discovery of cosmic rays. Cosmic rays are high-energy particles that travel through space and reach the Earth's atmosphere. They are believed to be made up of protons, electrons, and atomic nuclei, and they can have energies that are millions or billions of times greater than those of particles produced by particle accelerators on Earth. Hess discovered cosmic rays while conducting experiments in which he flew high-altitude balloon flights to measure the radiation levels at different altitudes. He found that the radiation levels increased with altitude, leading him to conclude that the radiation was coming from outer space and not from the Earth's surface. He named these high-energy particles "cosmic rays" because they seemed to be coming from the cosmos.