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| | Category:Astronomy - Definition, explanation |
 | | Astronomy is a science involving the observation and explanation of events occurringoutside Earth and its atmosphere. |
 | | All about infrared astronomy from NASA's infrared astronomy center: Discovery of infrared, what is infrared and infrared astronomy, history, the infrared universe, gallery, activities, discoveries, missions and a lot of links to IR astronomy sites. |
 | | Includes astronomy and space news, sky events, reprinted articles for the magazine, and astronomy and telescope resources. |
| lexikon.calsky.com /en/txt/cat/astronomy.php (398 words) |
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