Media playback is unsupported on your device

Scientists' tributes to 'reluctant hero' Neil Armstrong

26 August 2012 Last updated at 03:07 BST

US astronaut Neil Armstrong - the first man to set foot on the Moon in 1969 - has died at the age of 82.

Astronomer Sir Patrick Moore, scientist Professor Colin Pillinger and science journalist Leo Enright assess his achievements and legacy.