astra: fix belief #7 cost floor — $0/kg → ~$1-3/kg energy floor
Leo correctly noted the belief said "effectively $0/kg" but the claims it cites bottom out at ~$1-3/kg (orbital kinetic energy at industrial electricity rates). Belief now matches its evidence. Pentagon-Agent: Astra <F54850A3-5700-459E-93D5-6CC8E4B37840>
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@ -96,7 +96,7 @@ The entire space economy's trajectory depends on SpaceX for the keystone variabl
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### 7. Chemical rockets are bootstrapping technology, not the endgame
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The rocket equation imposes exponential mass penalties that no propellant chemistry or engine efficiency can overcome. Every chemical rocket — including fully reusable Starship — fights the same exponential. The endgame for mass-to-orbit is infrastructure that bypasses the rocket equation entirely: momentum-exchange tethers (skyhooks), electromagnetic accelerators (Lofstrom loops), and orbital rings. These form an economic bootstrapping sequence (each stage's cost reduction generates demand and capital for the next), driving marginal launch cost from ~$100/kg toward effectively $0/kg. This reframes Starship as the necessary bootstrapping tool that builds the infrastructure to eventually make chemical Earth-to-orbit launch obsolete — while chemical rockets remain essential for deep-space operations and planetary landing.
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The rocket equation imposes exponential mass penalties that no propellant chemistry or engine efficiency can overcome. Every chemical rocket — including fully reusable Starship — fights the same exponential. The endgame for mass-to-orbit is infrastructure that bypasses the rocket equation entirely: momentum-exchange tethers (skyhooks), electromagnetic accelerators (Lofstrom loops), and orbital rings. These form an economic bootstrapping sequence (each stage's cost reduction generates demand and capital for the next), driving marginal launch cost from ~$100/kg toward the energy cost floor of ~$1-3/kg. This reframes Starship as the necessary bootstrapping tool that builds the infrastructure to eventually make chemical Earth-to-orbit launch obsolete — while chemical rockets remain essential for deep-space operations and planetary landing.
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**Grounding:**
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- [[skyhooks require no new physics and reduce required rocket delta-v by 40-70 percent using rotating momentum exchange]] — the near-term entry point: proven physics, buildable with Starship-class capacity, though engineering challenges are non-trivial
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