# [TECH] Rocket & Space Launch
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**Rocketry** is the technology of reaction propulsion operating in vacuum, enabling satellite deployment, space exploration, and intercontinental ballistic missiles.
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## Overview
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Robert Goddard launched the first liquid-fuelled rocket (1926). WWII German V-2 (von Braun, 1944) proved large guided ballistic missiles were feasible. Sputnik (1957) opened the space age. Apollo 11 (1969) landed humans on the moon. Rockets deploy communication satellites, GPS, weather satellites, and Earth observation systems. SpaceX's Falcon 9 reusable first stage (2015) reduced launch costs by ~10× versus expendable rockets.
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## Key Actors
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- **Companies**: NASA (1958), Boeing, Lockheed Martin, SpaceX (2002), ULA, Roscosmos, Arianespace
- **Inventors**: Robert Goddard (1882–1945), Wernher von Braun (1912–1977)
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## Key Patents
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- Goddard, R. US Patent 1,102,653 (1914) — multi-stage rocket
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## Economic Value
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Global space economy: **$570 billion/year** (2023, Space Foundation). Commercial space launch market: $10B/year. GPS, satellite imagery, and satellite comms enabled by rockets: $500B+/year.
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## Notes
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Space Foundation *Space Report* 2023. SpaceX has reduced GTO launch costs from ~$65,000/kg (Space Shuttle) to ~$2,500/kg (Falcon 9 reuse), enabling the commercial space revolution.
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# Parents
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* [SCI] Analytical Mechanics⏎