By CT Jones Some writers focus on moral subtext in their works. Others, an overarching lesson. But for Andy Weir, there’s only one driving approach to creating his bestselling novels: science first. “There’s never any deeper message or meaning in any of my stories. It’s always just there to entertain,” Weir tells Rolling Stone. “I’m not trying to change your mind or set your opinion on anything. When you’re done with my book, I just want you to put it back on the shelf and think, ‘That was fun.’” It’s been almost 15 years since Weir became a New York Times bestselling author with his space-MacGyver odyssey The Martian, which became a seven-time Oscar-nominated film starring Matt Damon in 2015. Now, his work is back onscreen in a new interstellar offering: Project Hail Mary starring Ryan Gosling.…