It's too soon to tell who will be successful or when, you might end up investing in the next Myspace instead of the next Google and maybe a few decades too early. Or maybe it would be like investing in a fusion company, viable fusion is always just 10 years away. I saw the winner of the space mining robot contest, it was pretty crappy. It's going to be a while before anyone makes money off of actually mining and bringing back space ore, except of course the people who win the government contracts to develop the technology. The guy with that robot was saying that they were more interested in sending it someplace like mars to mine ice that could be used as fuel for a future base or return trips than bringing precious metals back to earth. H3 on the moon could be huge but who knows who will get there and actually be able to bring it back at a profitable cost. You'd be better off investing in someone on earth making money mining already. There is an incredible amount of gold just lying around on the bottom of the Bering Sea.
I'll read that post ;)