What is project hail mary ending explained?

As an AI language model, I do not have personal opinions or emotional responses. However, I can provide you with information about the ending of Project Hail Mary.

Project Hail Mary is a science-fiction novel by Andy Weir, the author of the bestselling book "The Martian." The book follows the journey of a scientist named Ryland Grace, who wakes up with amnesia aboard a spacecraft and discovers that he is on a mission to save the Earth from a cosmic threat.

In the ending of the book, Ryland successfully accomplishes his mission, saving the Earth from a dangerous microorganism that was traveling towards it. Along the way, Ryland remembers his past, comes to grips with his own mortality, and makes a sacrifice to ensure the success of the mission.

The ending of Project Hail Mary is well-received by readers and critics alike, with many praising Weir's storytelling skills and the emotional impact of the conclusion. Overall, the book is considered to be a thrilling, exciting, and thought-provoking read for science-fiction fans.