He's said a lot of weird stuff over the years, including something about a monolith on Mars' moon!
""We can explore the moon and develop the moon. We should go boldly where men have not gone before. Fly by the comets, visit asteroids, visit the moon on Mars, there's a monolith, a very unusual structure on this little potato-shaped object that goes around Mars once in 7 hours. When people find out about that, they're gonna say, who put that there, Who put that there? Well, the universe put it there. If you choose, god it put it there."