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.
Cosmology · Extragalactic astronomy · Galactic astronomy · Star formation · Stellar astronomy · Planetary science · Astrometry · Astrochemistry · Astrobiology
This category has the following 25 subcategories, out of 25 total.
The following 15 pages are in this category, out of 15 total. This list may sometimes be slightly out of date (learn more)