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 ...

NASA's car-size Curiosity rover is days away from its high-stakes landing on Mars, and a host of planned events will allow people to follow along as the spacecraft makes its thrilling journey to the ...

Mars has hosted a surprising number of robotic visitors, yet the question of where humans should touch down remains wide open. As engineers refine maps of potential Mars landing sites, one location ...

When Spirit dropped through the thin Martian air and bounced to a stop inside Gusev Crater, it did more than survive a high‑risk landing. It opened a new era in which rovers became the primary way ...

Landing humans on Mars could teach us whether life ever existed beyond Earth, how planets change over time, and how humans can live on other worlds. By studying Mars up close, astronauts could answer ...

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