SpaceX made history by returning the Heavy Booster to its launch site.SpaceX / Handout/Anadolu via Getty ImagesSpaceX made history as it returned its Super Heavy booster to its launch site in Texas.For Elon Musk, it was a chance to prove the doubters wrong — and he did.Missed deadlines and issues across his companies have raised concerns about his ability to deliver.It was a moment for the history books.