COLORADO SPRINGS, Colo.--Space Exploration Technology Corp. (SpaceX) expects to capture more than half of the commercial launch market after it introduces its Falcon Heavy launcher, company President and CEO Gwynne Shotwell said Monday.Shotwell told an audience here at the National Space Symposium (NSS) that SpaceX captured 30 percent of the commercial launch market over the last three years. She said there is a very large commercial marketplace that has been relatively stable for decades and she anticipates the marketplace remaining…