No one is happy with NASA's new idea for private space stations

Most elements of a major NASA event this week that laid out spaceflight plans for the coming decade were well received: a Moon base, a focus on less talk and more action, and working with industry to streamline regulations so increased innovation can propel the United States further into space.

However, one aspect of this event, named Ignition, has begun to run into serious turbulence. It involves NASA's attempt to navigate a difficult issue with no clear solution: finding a commercial...