Zero Gravity Corporation Announces Investment From Private Equity Firm Rock Mountain Capital Space entertainment and tourism company will use instrumental contribution to expand weightless flight operations; Welcomes investment expert David Stonehill to board of directors News provided by Share this article (ZERO-G), a weightless flight company offering the country's only microgravity experience, announced a recent financing round led by Rock Mountain Capital (RMC), a private equity firm working with entrepreneurs and management teams in consumer goods and services, TMT and healthcare. RMC's investment will help further the commercial development of ZERO-G's consumer flight program and the company's renowned weightless research lab.