Flying the SpaceX Falcon Heavy with ULA upper stage is an option for lunar missions beyond 2022.
The space agency sticks with the SLS and considers options to keep the rocket debut in 2020.
Commerce secretary pushes greater U.S. share of the global space economy.
ULA CEO Tony Bruno has bold claims for the company’s space propulsion module, which starts off as an upper stage on ULA’s planned Vulcan rocket.
U.S. Air Force mulls bids to ensure at least two commercially viable orbital space transport systems from 2022. Rockets with Russian engines need not apply.