Jared Isaacman and Sarah Gillis played it relatively safe when they floated outside of their Crew Dragon spacecraft just before 7:00 a.m. E.D.T. today, becoming the first nongovernmental astronauts to perform an extravehicular activity (EVA), better known as a spacewalk. But they knew the risk they were taking. In 1965, the Soviet Union’s Alexei Leonov could barely fit back into his capsule due to an overinflated suit when he performed history’s first EVA.