Legendary astronaut John Young, who walked on the moon and later commanded the first space shuttle flight, has died, NASA said Saturday. Young was 87.The space agency said Young died Friday night at home in Houston following complications from pneumonia.NASA called Young one of its pioneers – the only agency astronaut to go into space as part of the Gemini, Apollo and space shuttle programs, and the first to fly into space six times. He was the ninth man to walk on the moon.“Astronaut John Young’s storied career spanned three generations of spaceflight,” acting NASA administrator Robert Lightfoot said in an emailed statement. “John was one of that group of early space pioneers whose bravery and commitment sparked our nation’s first great achievements in space.”Young was the only spaceman to span NASA’s Gemini, Apollo and shuttle programs, and became the first person to rocket away from Earth six times. Counting his takeoff from the moon in 1972 as commander of Apollo 16, his blastoff tally stood at seven, for decades a world record.He flew twice during the two-man Gemini missions of the mid-1960s, twice to the moon during NASA’s Apollo program, and twice more aboard the new space shuttle Columbia in the early 1980s.