Human colonization may still be a way off, but NASA has been exploring Mars with a series of ever-larger mobile science labs. Some are still going.

NASA's Mars rovers have accomplished a whole lot since the first one landed on the red planet in the late '90s, but even the latest members of the fleet still have plenty of limitations. For one, they ...

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