Mars colony insurance value against extinction depends on which independence threshold is achieved: genetic survival (500-10,000 people, achievable within decades) provides limited insurance, while technological independence (100K-1M+ people for self-sustaining industrial civilization) requires a century or more

Academic literature on minimum viable Mars population identifies two distinct independence thresholds with radically different timelines and insurance implications. Genetic independence requires 500-1,000 people for short-term inbreeding avoidance and 5,000-10,000 for long-term genetic sustainability (Smith 2020 recommends 40,000 as safer figure accounting for genetic drift). This threshold is achievable with Starship transport logistics within 30-50 years. However, technological independence—the ability to maintain industrial civilization without Earth resupply—requires an estimated 100K-1M+ people to support all specialized knowledge workers (semiconductor fabs, medical devices, energy infrastructure, precision manufacturing). This creates a critical insurance gap: during the 50-100 year Earth-dependent phase, a Mars colony of 10,000-100,000 people remains critically dependent on Earth for semiconductors, precision manufacturing, advanced medical equipment, and replacement parts for life-critical systems. The colony provides genetic diversity preservation but not civilizational continuity insurance. A slow-developing catastrophe (70-year civilizational collapse) would destroy the Mars colony through supply chain severance before it achieved technological independence. The insurance value is real but scope-limited: it protects against sudden location-correlated extinction (asteroid impact) but not against gradual civilizational collapse scenarios where Earth's industrial capacity degrades over decades.