AST SpaceMobile managed to defy stock market gravity this week.Despite bearish trading for the broader market, AST SpaceMobile (ASTS -0.61%) stock managed to close out this week's trading with big gains. The company's share price rose 9% compared to where it stood at the end of the previous week's trading. Across the same stretch, the S&P 500 fell 0.3%, and the Nasdaq Composite fell 0.7%.The stock market faced pressures this week as investors honed in on macroeconomic risk factors and the possibility that t ...