One of the great unsolved problems in modern planetary science is written on the surface of Mars. Mars has canyons that were carved by rivers, so it was once warm enough for liquid water. How—and ...

Mars, a planet once capable of sustaining liquid water and harboring flowing rivers, today stands as a frozen desert. For years, scientists have struggled to understand why a planet with so many Earth ...

Mars is the fourth planet from the sun and has a distinct rusty red appearance and two unusual moons. The Red Planet is a ...

Yet more than one billion people, one-sixth of the Earth's population, actually live in desert regions. Deserts cover more ...

For decades, scientists have theorized about how Mars reached its current state. Many believe that the Red Planet's surface may have once been covered in rivers and oceans. But, if that's really the ...

NASA’s Curiosity rover captured this photo as it ascended the Martian mountain Mt. Sharp. A study proposes a new explanation for why Mars is a barren desert today, despite having many similarities to ...