Which of these three space stocks will win the profitability race?After a long holiday weekend, shares of U.S. space stocks took off like rockets on Tuesday. As of 1:20 p.m. ET, AST SpaceMobile (ASTS 6.09%) had gained 6.3% and seemed poised to resume its winning streak. Rocket Lab USA (RKLB 5.47%) wasn't far behind, up 5.6% after announcing a successful weekend rocket launch.Best of all was Virgin Galactic (SPCE 22.52%) stock. On Monday, multiple news outlets reported that the Swiss National Bank has been b ...