NASA astronauts

RIO BRAVO DEL NORTE NATIONAL MONUMENT, NM - NASA astronaut candidates go through geology training in New Mexico. JULY 15, 2014. CREDIT: Erich Schlegel/Disappearing Rio Grande Expedition — RIO BRAVO DEL NORTE NATIONAL MONUMENT, NM – NASA astronaut candidates go through geology training in New Mexico. JULY 15, 2014. CREDIT: Erich Schlegel/Disappearing Rio Grande Expedition

RIO BRAVO DEL NORTE NATIONAL MONUMENT, NM – NASA astronaut candidates go through geology training in New Mexico. JULY 15, 2014. CREDIT: Erich Schlegel/Disappearing Rio Grande Expedition