Where Elon Musk talks openly about building a city on Mars, NASA has been careful to draw a line between exploration and colonization. The agency has long voiced a desire to send astronauts to explore ...

The race to Mars has quietly become the defining contest of twenty-first century spaceflight, pitting a state-backed Chinese program, a commercially driven SpaceX campaign, and a methodical NASA ...

Musk’s vision for cities on the moon and Mars is an attempt to make science fiction a reality.

NASA has lost contact with one of its three spacecraft orbiting Mars, the agency announced Tuesday. Meanwhile, a second Mars orbiter is perilously close to running out of fuel, and the third mission ...

We’re going back to the moon. Well, at least that’s the hope.