Watch 2 astronauts perform 1st spacewalk of 2023 at space station today

James Irwin was the first moonwalking astronauts to die when he suffered a heart attack at age 61 in 1991. He always believed that his heart disorder was related with his flight to the moon. NASA didn't substantiate Irwin's claim because he was the only astronaut to develop the problem

In 2011, astronauts Neil Armstrong and Gene Cernan, first and last men on the Moon, advocated for Space Shuttles to be put back in service. Armstrong supported NASA's proposed Space Launch System, which the agency said could one day take man to Mars

NASA to Provide Coverage of US Spacewalk, Preview News Conference