McGregor will soon get a second SpaceX plant, this one geared to make 800 to 1,000 rocket engines per year to help the company reach its interplanetary ambitions, CEO Elon Musk announced Saturday.

Tucson’s newest small-rocket startup is expanding into a new space with plans for its first orbital flight by 2023. Phantom Space Corp., founded by SpaceX veteran Jim Cantrell, has moved into a 32,000 ...