Space Exploration Timeline, 1609–2030: From Kepler's Laws to Artemis
The orbits were worked out long before anything could fly them
Space-exploration timelines usually begin with Sputnik in 1957. But why a satellite does not fall down had been explained by Newton in 1687; what was missing was any way to throw something that fast. This timeline runs the theory of orbits and rockets, and what was learned only by going, along the top of the axis, and what actually flew along the bottom — 42 entries, from Kepler turning planetary orbits into formulas in 1609 to a spacecraft due at Europa in 2030.
Dashed borders and hollow dots mark projected, not-yet-achieved items. “Unverified” marks entries not yet confirmed against a primary source.
Basic research (theory and discovery)
Engineering and deployment
← Scroll horizontally. Above the axis is basic research (theory and discovery); below it, engineering and deployment. How crowded a column looks is how dense that period was. Tick spacing narrows where entries cluster.