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Category:Astronomy 
Summary
 | Pages in this category should be moved to subcategories where applicable. This category may require frequent maintenance to avoid becoming too large. It should directly contain very few, if any, pages and should mainly contain subcategories. |
| Library cataloging and classification | |
|---|---|
| main topic | astronomy |
| Colon | B9  |
| Dewey Decimal | 520 |
| Library of Congress | QB |
| Universal Decimal | 52 |
Wikimedia Commons has media related to Astronomy.
Wiktionary has a category on Astronomy.
Astronomy is a science involving the observation and explanation of events occurring outside Earth and its atmosphere. It includes the study of the origin, evolution, and physical and chemical properties of objects that can be observed in the sky, space, and in the whole universe.