What has been discovered about the Mars surface? How does that relate to human missions?

Scientists have been studying the Martian surface with spacecraft since 1965 when the Mariner 4 spacecraft collected the first images. Since then, there have been additional flyby missions, as well as orbiting and landed missions. You might recall the movie, The Martian, and the attempt by the character Mark Watney to grow crops to survive … Continue reading What has been discovered about the Mars surface? How does that relate to human missions?