Outline of astronomy
Outline of astronomy (short and simple)
Astronomy studies the universe beyond Earth. It looks at how the universe began, how it evolves, and the physics, chemistry, and motion of celestial objects such as galaxies, stars, and planets, plus phenomena that occur outside Earth’s atmosphere like the cosmic background radiation.
Astrobiology links astronomy to biology by studying possible life in the universe.
Key topics include:
- History of astronomy
- Astronomical objects: the Sun, planets and other small bodies, variable stars, supernovae, black holes
- Obsolete constellations (examples include Ptolemy’s Argo Navis)
- Space agencies and space exploration
This page was last edited on 2 February 2026, at 21:05 (CET).