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break-up: magic ~ 42 nmi @100kft - no more heating @50kft - free fall (straight down) & wind [[left margin]] 80km 80,000 m [250,000 ft] [[/left margin]] 10-40% of re-entry material [[?]] break-up: early shedding ~ 250kft ET ~ 220K ± 20kft standard (w/ dramatic event) large aerodynamic deccl loads shuttle= early shedding 230k break-up ≈ 200k SSTO relevance (!)