Andy Weir’s first time at the Hollywood rodeo was a singular trip. His debut novel, “The Martian,” went from self-published project to blockbuster, best picture-nominated film starring Matt Damon. His most recent book, “Project Hail Mary,” was also a sensation, and its adaptation, starring Ryan Gosling as a middle school science teacher tasked with saving humanity from slow extinction, charts warmly familiar territory: a lone man, stuck in space far from Earth, solving science problem after science problem with many a humorous aside. Weir joined the Book Review’s podcast and spoke to the host, Gilbert Cruz, about the similarities and differences between Mark Watney and Ryland Grace (the main characters of “The Martian” and “Project Hail Mary”), his second novel, “Artemis,” and the alien character that readers have fallen in love with. We would love to hear your thoughts about this episode, and about the Book Review’s podcast in general. You can send them to thebookreview@nytimes.com. “The Book Review Podcast” is hosted by Gilbert Cruz and produced by Sarah Diamond and Amy Pearl. The show is edited by Larissa Anderson and mixed by Pedro Rosado. Special thanks to MJ Franklin, Dahlia Haddad, and Paula Szuchman. Illustration by The New York Times; Photo: Taylor Glascock for The New York Times Subscribe today at nytimes.com/podcasts (http://nytimes.com/podcasts) or on Apple Podcasts and Spotify. You can also subscribe via your favorite podcast app here https://www.nytimes.com/activate-access/audio?source=podcatcher. For more podcasts and narrated articles, download The New York Times app at nytimes.com/app.