Armstrong's authorized biography, "", was published in 2005. For many years, he turned down biography offers from authors such as Stephen Ambrose and James A. Michener, but agreed to work with James R. Hansen after reading one of Hansen's other biographies. He recalled his initial concerns about the Apollo 11 mission, when he had believed there was only a 50% chance of landing on the Moon. "I was elated, ecstatic and extremely surprised that we were successful". A film adaptation of the book, starring Ryan Gosling and directed by Damien Chazelle, was released in October 2018.