Exploration Program, and an assessment of critical unanswered questions.

Humankind's next giant step may be onto Mars. But before those missions can begin, scientists need to make scores of breakthrough advances, including learning how to grow crops on the red planet.

visible + mid-IR wavelengths for Mars as a function of viewing angle, illumination, season. We also considered the appearance of an increasingly frozen Mars and simulated its detection versus real ...

Humans have stepped foot on the moon, but we haven't made it to Mars. Yet. Amid the myriad barriers, a key issue to sending a crew to Mars is food. Weight, volume and longevity limit the kinds – and ...