TL;DR
The Moon is full of things people would love to use: soil to build with, ingredients for rocket fuel, and helium-3, a rare form of helium that cools quantum computers and sells for up to $20 million a kilogram. The question that decides whether Moon bases and Moon mines actually get built is a plain one: does any of it pay for the trip? Europe's space agency has now put three research teams on exactly that question. One of them, a Polish team, is building an AI tool to work out how much helium-3 a Moon miner would have to bring home just to break even. That number would be the first independent yardstick for a business that startups say could start delivering within a few years. To see our odds on Moon-mined helium-3 reaching a paying buyer, and the timeline of the missions that lead there, subscribe.
Below the line, for paid subscribers: The full story: where it stands, how we got here and what's dated next; our labeled speculation on what it adds up to; and every source.



