Acting NASA Administrator Robert Lightfoot speaks during an event NASA introduced 12 new astronaut candidates in Houston Texas.

Acting NASA Administrator Robert Lightfoot speaks during an event in which NASA introduced 12 new astronaut candidates, (front row from left) Warren Hoburg, Robert Hines, Matthew Dominick, Raja Chari, Zena Cardman, Kayla Barron, (back row from left) Jessica Watkins, Francisco Rubio, Loral O’Hara, Jasmin Moghbeli, Robb Kulin and Jonathan Kim at NASA’s Johnson Space Center in Houston, Texas. After completing two years of training, the new astronaut candidates could be assigned to missions performing research on the International Space Station, launching from American soil on spacecraft built by commercial companies, and launching on deep space missions on NASA’s new Orion spacecraft and Space Launch System rocket. Photo Credit: (NASA/James Blair)