U.S. Vice President Mike Pence poses for a group photograph with NASA's 12 new astronaut candidates at NASA’s Johnson Space Center in Houston, Texas, U.S., June 7, 2017. NASA astronaut candidates, standing from L-R, Robb Kulin, Jonathan Kim, Robert Hines, Warren Hoburg, Matthew Dominick, Kayla Barron, Jessica Watkins, from L-R kneeling, Francisco Rubio, Loral O’Hara, Jasmin Moghbeli, Zena Cardman, and Raja Chari. Bill Ingalls/Courtesy NASA/Handout via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. MANDATORY CREDIT.