Let’s learn how to extract space resources closer to home.
The UK Daily Mail recently published a piece extolling the benefits of asteroid mining (before lightly tripping over some mundane, yet critical, technical details). The article leads with the headline: Single asteroid worth £60 trillion if it was mined – as much as world earns in a year. Should we chide them for such blatant sensationalism? Then again, is it blatant, or are they merely following an established pattern?
Asteroid mining is a field with lots of hype but little sober consideration. To redeem the technique of in situ resource utilization (ISRU) from the realm of ridicule and science fiction and make it a routine aspect of space mission architectures, we must honestly discuss the difficulties of extracting useful product from raw asteroid debris.
As with every Solar System body of interest and potential use, I am firmly convinced we will eventually mine asteroids. In truth, if we do not take up these formidable technical challenges, there is little hope for any permanent and extensive human presence in space. As long as we confine ourselves to launching everything we need for spaceflight from the bottom of the deepest gravity well in the inner Solar System, we will remain mass- and power-limited and thus, capability-limited.
Essential, low-information density material – spaceflight’s “dumb mass” of propellant and consumables – should be obtained from sources in space, rather than long-hauled (at great cost) from Earth. Only complex, high-information density items not easily made in space should be brought up from Earth.