AST SpaceMobile stock has rocketed higher by more than 75% in less than a week. Here's what investors need to know.AST SpaceMobile (ASTS 16.40%) stock has continued to soar since it announced its latest business update and second-quarter results last week. The march higher began after the company reaffirmed that plans for its most critical satellite launch ever are on track.On Friday, Bank of Nova Scotia, or Scotiabank, analyst Andres Coello raised his firm's price target on the space communications company ...