Speculative investors' next great opportunities are (literally) out of this world.Historically, space exploration and putting satellites into orbit has been within the purview of government-funded agencies like NASA.That's changing, though. For-profit corporations can handle this work at least as cost-effectively as government-run organizations can. Elon Musk's SpaceX recently facilitated the world's first-ever private citizen spacewalk, for example, while Jeff Bezos' Blue Origin is mainstreaming space tour ...