Neil Armstrong hails John Glenn's feat
The first man to set foot on the moon has led the tributes to the first American to orbit the Earth on the 50th anniversary of the feat.
Neil Armstrong was the surprise speaker at an Ohio State University gala honouring John Glenn half a century after Mr Glenn's historic 1962 space flight.
Mr Armstrong said there was a need for leadership in the space programme and Mr Glenn "literally rose to the occasion".
Mr Glenn has had his share of accomplishments. But the former astronaut and US senator from Ohio recently said he envies Mr Armstrong and wishes he could have been part of the first manned moon landing in 1969.
Mr Glenn got another surprise earlier when Nasa enabled him to speak live with crew members from the International Space Station.