The Alabama author who wrote the biography of Neil Armstrong adapted last year into a major motion picture is wrapping up a second book about the famous Apollo 11 astronaut.

James Hansen, professor emeritus at Auburn University, said he is putting the “finishing touches” on his new book about the first man to walk on the moon, the school announced Friday.

The new book comes as America this week is celebrating the 50th anniversary of the Apollo 11 mission. Armstrong and Buzz Aldrin landed on the lunar surface and made their first moonwalks 50 years ago Saturday.

Hansen’s first book on Armstrong, “First Man,” was published in 2005. The movie, with Ryan Gosling portraying Armstrong, carried the same name as the book and was released last year.

The new book is titled "Dear Neil Armstrong: Letters to the First Man from All Mankind." As the title suggests, the book is a compilation of letters sent to Armstrong following the moon mission in 1969.

It's due to be released in October.

“What’s interesting about this book is what we can learn from reading the types of letters that were written to Armstrong not just immediately after Apollo 11 but for the rest of his life,” Hansen said in the school's announcement.

Hansen also recalled his memories of the moon landing in the Auburn announcement.

“The landing took place itself in the mid-to-late afternoon, depending on your time zone,” he said. “I was watching a baseball game, and actually the baseball games were recognizing it and everyone stood up at one point and prayed for the Apollo astronauts and then when it was announced that they landed, it was on the scoreboard and they stopped the game and everyone applauded.”