| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| High Energy Particles | Space | Charged atomic particles moving rapidly, often at a significant fraction of the speed of light. They can penetrate matter, ionize the material which they traverse and emit energetic photons (e.g.of x-rays). See also solar energetic particles. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
