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Arguably the third thing is ISRU (In-Space Resource Utilization), aka, mining asteroids for fuel and materials. But that's not immediately necessary and doesn't
by bmcusick 9y ago
Arguably the third thing is ISRU (In-Space Resource Utilization), aka, mining asteroids for fuel and materials. But that's not immediately necessary and doesn't count as "around the corner".
- jholman 9y agoMy understanding is that "ISRU" normally stands for "In Situ Resource Utilization", which can include mining asteroids (if your locale is 'asteroid belt'), but also includes using fuel that can be generated from resources found on a planet or moon.