Ask HN: Entering markets with high capital barriers to entry

Hello HN, a question that hits less at the software side of things and more on a different part of the business landscape -

What are some key lessons to apply when someone wants to enter a marketplace with > internet/software start-up costs?

* I love the idea of bootstrapping a web startup on beans and rice, but that doesn't work as well for someone trying to develop new ways to e.g. design wind turbine blades.

* I am excited by a lot of environmental tech in particular, and a lot of those markets seem like there are high(er) barriers to getting involved.

* Doubly so for what I would have to say would be my "dream industry," private space exploration. People don't seem to want to invest on spec for the payoff when I bring home that first $20 trillion asteroid full of tasty ore.

Looking for general advice from people who have navigated this kind of issue before. I think there is still some room for 'launching and iterating' and having something to start to serve as a launchpad, but just wondering!