The United States has celebrated the 50th anniversary of the space flight in which John Glenn became the first American to orbit Earth.
The BBC reports the former astronaut and senator, who is now 90, marked the occasion with a live video conversation with the crew of the International Space Station.
John Glenn says his orbital flight was the best day of his life.
The conversation was part of a larger forum on Nasa's future held at Ohio State University.
Mr Glenn is only one of two surviving Mercury astronauts, who were the first in the country's space programme.
It stepped up the race between the US and Russia, which put the first man into space 10 months earlier.