For nearly a decade after its formation in December 2006, the United Launch Alliance (ULA) joint venture between Boeing (BA 0.12%) and Lockheed Martin (LMT 0.45%) was the de facto dominant space-launch company in the U.S.Then came SpaceX, successfully launching a Falcon 1 rocket to orbit in 2008, launching a bigger Falcon 9 rocket in 2010, and then landing Falcon 9 rockets with regularity starting in 2015. Ever since, the balance of power between ULA and SpaceX has shifted to the point that SpaceX is gettin ...