The part of the atmosphere containing a high concentration of ions and free electrons, located about 60 to 500 kilometers above the earth; it reflects radio waves and is essential for shortwave communication.

An instrument for detecting and measuring ionizing radiation or particles

radiation that carries enough energy to detach electrons from atoms, such as nuclear radiation

to get divorced shortly after getting married; a divorce that happens very quickly after a wedding

to resign or leave a job very shortly after being hired