Sally Ride, the first American woman to fly in space, has died. She was 61.
NASA confirmed her death Monday afternoon and President Barack Obama called her a national hero.
Her office in San Diego said she died of pancreatic cancer.
Ride rode into space on the shuttle Challenger in 1983 when she was 32.
"Sally Ride broke barriers with grace and professionalism -- and literally changed the face of America's space program," said NASA Administrator Charles Bolden in a statement posted to NASA's website. "The nation has lost one of its finest leaders, teachers and explorers."