Cosmic ray
Cosmic ray
Cosic ray (/ˈkɒz.mɪk reɪ/) is a term used in astrophysics to describe high-energy radiation, mainly originating outside the Solar System and even from distant galaxies.
Etymology
The term "cosmic ray" is derived from the Greek word "kosmos" meaning "universe" and the English word "ray", referring to a beam of light or other form of energy. The term was coined by Robert Millikan in the 1920s.
Definition
Cosmic rays are high-energy protons and atomic nuclei which move through space at nearly the speed of light. They originate from the sun, from outside of the solar system in our own galaxy, and from distant galaxies. Upon impact with the Earth's atmosphere, cosmic rays can produce showers of secondary particles that sometimes reach the surface.
Related Terms
- Astrophysics: The branch of astronomy that deals with the physics of the universe, including the physical properties of celestial objects, as well as their interactions and behavior.
- Solar System: The gravitationally bound system of the Sun and the objects that orbit it, either directly or indirectly.
- Galaxy: A gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.
- Proton: A subatomic particle, symbol p or p+, with a positive electric charge of +1e elementary charge and a mass slightly less than that of a neutron.
- Atomic Nuclei: The small, dense region consisting of protons and neutrons at the center of an atom.
- Speed of Light: The maximum speed at which all information in the universe can travel.
- Earth's Atmosphere: The layer of gases, commonly known as air, retained by Earth's gravity, surrounding the planet and forming its planetary atmosphere.
External links
- Medical encyclopedia article on Cosmic ray
- Wikipedia's article - Cosmic ray
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