As we get closer to sending humans to Mars, there’s been more talk about the technology and money it will take to colonize the planet. But science fiction writers have been pondering this for some time. Andy Weir is author of “The Martian,” which showed us how to survive on Mars. His new book, called “Artemis,” is about a colony on the moon. Marketplace Tech host Molly Wood talked with Weir about the real research that went into his science fiction.