| Astronomy Discoveries |
| The Planets Move (Third millennium BC - fifth century BC) |
| Heliocentrism (1540s) |
| Elliptical Planetary Orbits (1600s) |
| Moons of Jupiter (1600s - 1610s) |
| Halley's Comet (1700s - 1750s) |
| The Milky Way: a Gigantic Disk of Stars (1780s - 1830s) |
| General Relativity (1910s) |
| The Universe Is Expanding (1920s) |
| Radio Waves from the Center of the Milky Way (1930s) |
| Cosmic Microwave Background Radiation (1960s) |
| Gamma-Ray Bursts (1960s - 1990s) |
| Extrasolar Planets (1990s - 2000s) |
| The Universe Is Accelerating (1990s - 2000s) |
| Dark Energy (1998) |
| Exoplanets |
| The Missions of the Voyager spacecraft |
| Inflation during the Early Big Bang |
| Black Holes exist |
| Gamma Ray Bursts |
| Galaxies eat one another for fun |
| Supernova 1987A |
| The Great Attractor |
| The Milky Way is a Barred Spiral |
