Radiation directly emitted by radiation source
This entry is missing Overview , add relevant content to make the entry more complete, and it can also be upgraded quickly. Hurry up edit Come on! Primary cosmic rays refer to the radiation directly emitted by radiation sources, such as the stars we see, which are one of the radiation sources. There are many radiation sources in the universe, including quasars, pulsars (the products of big stars in their later years), etc. According to some reports, black holes also produce their own radiation, called Hawking radiation or black hole radiation, These are cosmic rays.
- Chinese name
- Primary cosmic ray
- Introduction
- It refers to the radiation directly emitted by the radiation source
- Features
- Ubiquitous in our universe
- Advantages
- Relatively high energy, relatively strong penetration
The characteristics of cosmic rays are that they are ubiquitous in our cosmic space, almost everywhere, with relatively high energy and relatively strong penetration.
Cosmic rays can be high-speed nucleons, electrons, X-ray, etc. Primary cosmic rays are relative to Secondary cosmic ray In other words, it is the radiation directly emitted by the radiation source in the universe. 
