|
|
 |
|
|
|
|
| Fraunhofer lines [ frównhófər linz ] |
plural noun |
|
| Definition: |
| |
dark lines in Sun's spectrum: narrow dark lines in the Sun's spectrum, caused mainly by absorption in the cooler outer layers of the Sun's atmosphere
|
| [Mid-19th century. After Joseph von Fraunhofer (1787-1826), German scientist] |
|
|
|
