| 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 |
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.
This category has the following 39 subcategories, out of 39 total.
The following 68 pages are in this category, out of 68 total. This list may not reflect recent changes.
