KENT, Wash.—Notebooks in hand, we gathered around a long table inside Jupiter 2, a conference room on the second floor of Blue Origin’s headquarters. Ten of us had come at the company’s invitation to see for the first time, first hand, where Blue Origin builds its spaceships and rockets. For years, this had been undiscovered country for journalists. And then Jeff Bezos, as casual as you please in a blue and white checkered shirt and designer jeans, strolled into the room.