Celebrities used Twitter to pay their respects to Neil Armstrong, including Simon Pegg, Richard Branson and Jamie Bell.
Just heard Neil Armstrong took the giant leap. RIP a true modern hero and conqueror of the moon. Will be ever remembered.
RIP Neil Armstrong. My first inspiration to try to make space travel possible for all. A hero for anyone who looks to the stars & dreams
Very moved at the news of Neil Armstrong. Inspired me constantly through my life. Once more he's slipped the heavenly bonds of earth. #RIP