The 20th century began with the exploration of the last unknown continent on Earth - Antarctica. So it's somewhat appropriate that as the century closes, another great act of polar exploration is ...

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

Here’s what you’ll learn when you read this story: There was just one problem: The orbiter would never reach Mars. Superficially, everything seemed to be going according to plan. Lockheed Martin was ...

(CNN) — Here’s a look at the exploration of Mars. The United States, Soviet Union and China are the only three countries to land a spacecraft on Mars. There have been nine successful US Mars landings: ...