Recently, I've been reading about those space mining companies (like Deep Space Mining and Planetary Resources), and from an amateur point of view, I thought that the overall idea was pretty interesting. I mean, the concept is that they would be mining resources that could be useful in space (and so we wouldn't have to launch those from Earth at the cost of millions of dollars). But what's the feasibility of such a project? Are there any chances that we could develop this technology within the next decade or so? Do these companies have any chances of becoming profitable?