Suit up! These photos show NASA astronaut candidates astro_fuhrmann and astro_lawler preparing for their training flights aboard a high-flying WB-57 aircraft. These high-altitude flights train astronaut candidates to operate in tight spaces while wearing a pressure suit—a feat that prepares them for missions to the ISS, Moon, or beyond. Why are pressure suits necessary? The two main bodily dangers of high altitude are extremely thin air and low oxygen. Pressure suits counteract those dangers and make it possible to survive if something goes wrong in the aircraft. Credit: NASA #NASA #FlightSuit #Aircraft