Jenny Gruber has wanted to be an astronaut since she was seven. That’s when she saw “The Right Stuff,” the 1983 movie that chronicled the early years of America’s human space program. But she thought it unlikely that a child growing up amid meager surroundings in Omaha, Neb., could ever join the ranks of those who led the way into space. “I grew up in a trailer park in Omaha. My dad is a bricklayer. My mother is a teacher. Statistically speaking, I should not be where I am today,” Gruber said.