Tributes have been paid to US astronaut Neil Armstrong, who has died aged 82.
He had heart-bypass surgery earlier this month to relieve blocked coronary arteries.
As commander of the Apollo 11 mission in July 1969, he became the first human to set foot on the moon.
Astronomer Sir Patrick Moore said: “As the first man on the moon, he broke all records.
“I knew him well. He was a man who had all the courage in the world.”
Jamie Burgess, from the National Space Centre, told Sky News: “It’s extremely sad news. It’s a terrible shock to the science community.”
He added: “He will be sorely missed.”
He radioed back to Earth the historic news of “one giant leap for mankind” and spent nearly three hours walking on the moon with Edwin “Buzz” Aldrin.
He and his wife Carol married in 1999 and made their home in the Cincinnati suburb of Indian Hill, but he has largely stayed out of public view in recent years.
He spoke at Ohio State University in February at an event honouring fellow astronaut John Glenn and the 50th anniversary of Mr Glenn becoming the first American to orbit the Earth