The United States named 12 new astronauts this week. The astronauts will work for NASA, the American space agency. The astronaut class of 2017 includes doctors, scientists, engineers, pilots and military officers. Seven are men and five are women. The youngest is 29 years old. The oldest is 42. Vice President Mike Pence officially welcomed the group during a ceremony Wednesday at NASA’s Johnson Space Center in Houston, Texas. Pence offered congratulations from President Donald Trump. He said the president is firmly committed to NASA’s noble mission, leading America in space.