ULA test-fires new Vulcan Centaur rocket on the launch pad for 1st time (video)
United Launch Alliance's next-generation Vulcan Centaur rocket took a big step toward its debut launch, acing a crucial engine firing today (June 7).
United Launch Alliance's next-generation Vulcan Centaur rocket took a big step toward its debut launch, acing a crucial engine firing today (June 7).