About this episode
We unpack Caleb Scharf’s 2026 concept of the interplanetary habitable zone, which asks not only where life can originate but where a spacefaring civilization can actually expand. Four levers—solar power, radiation safety, material resources, and delta V—shape a system’s expansion potential. An agent-based simulation shows the Moon as a stepping stone to Mars and the asteroid belt, with over 900,000 accessible asteroids between 1.5 and 4 AU. TRAPPIST-1 is a cautionary contrast, lacking a rich belt to fuel expansion. We end by imagining technosignatures of interplanetary highways as evidence of cosmic road trips.
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