radiation Energy emitted in the form of waves or particles that radiates out from a source. Examples include electromagnetic radiation, cosmic rays, and streams of alpha particles or beta particles. In high-energy forms, radiation poses a danger both to human space travelers and electronic devices aboard spacecraft (see radiation protection in space). Related category • ATOMIC AND NUCLEAR PHYSICS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |