A 1,000-tonne rock needs lunar capture. Axes: required Δv (x), consumables (y, up), authority (z). The rock travels left as patience grows — gravity absorbs more of the work. Zones: A no-engine (green), B electric (amber), C candle (pink). Slide the time horizon.
Time horizon τ
3.0 yr
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Log axes · consumables for the required Δv · candle also consumes rock mass