Until August la roche posay hydreane riche buy A year later, larger craft would begin two- to three-year missions to land and take samples for analysis. Most dramatic of all, the company sees a "harvester" craft heading out in 2019 to capture and divert the most promising asteroids so that they settle into orbit around Earth by 2021. On these, Gump said, DSI would try to make propellant and mine nickel and iron to make the building components for new structures in space.