Dr Christina Mackaill has been teaching emergency departments about how to treat astronauts after returning to Earth.
The four astronauts who flew in Nasa's Artemis II mission around the moon have been welcomed home.
The BBC's Science editor tries the health checks Nasa carries out on its astronauts.
BBC Science Editor Rebecca Morelle reflects on how it felt to watch history being made.
The four astronauts flew around the Moon in a nine-day voyage that took them further from Earth than any humans in history.
Of the 24 Nasa astronauts who travelled to the Moon in the Apollo missions of the 1960s and 1970s, just five remain.
Four astronauts splashed down in the Pacific after a nine-day voyage that took them further from Earth than any humans.
The four crew members of the Artemis II are back on Earth after their 10-day mission to the Moon.
The mission was almost flawless but there are considerable obstacles ahead before a Moon landing.
