What major themes does Andy Weir explore in Project Hail Mary?

In Project Hail Mary, Andy Weir explores major themes including survival against overwhelming odds, the power of scientific inquiry and problem-solving, and the importance of cooperation and friendship across species. The story emphasizes how collaboration—between Ryland Grace and the alien Rocky—can overcome existential threats, highlighting empathy and mutual aid as crucial for survival. Additionally, the novel touches on sacrifice, as Grace ultimately gives up his chance to return to Earth to help save another civilization.