The Martian is a science fiction novel written by Andy Weir. The story follows astronaut Mark Watney, who is left stranded on Mars after his crew mistakenly believes he has died during a mission. With limited supplies and no way to communicate with Earth, Watney must use his ingenuity and scientific knowledge to survive on the hostile planet. The Martian is a gripping and realistic portrayal of one man's struggle for survival in the harsh conditions of space.