Cosmic-ray research is the study of high-energy particles that originate from outside the Earth's atmosphere, mainly from sources such as supernovae, black holes, and other astrophysical phenomena. These particles are constantly bombarding the Earth, and scientists use various methods to detect and study them, including ground-based detectors, satellites, and balloon-borne instruments. Studying cosmic rays can provide insights into the origins of the universe, the properties of astrophysical objects, and the nature of high-energy particle interactions. This field of research is important for understanding the fundamental principles of astrophysics and the nature of the cosmos.