NASA is sending a nuclear-powered spacecraft to Mars. Alongside Tuesday's announcement of its new Ignition program, which features a planned Moon base and a successor to the International Space ...

A researcher says he found a possible shortcut to Mars that would halve the time it takes to travel to the planet and back to ...

Elon Musk says SpaceX has shifted its near-term priorities from Mars settlement plans to building what he called a “self-growing city on the Moon,” arguing the lunar target is faster and more ...

The rusty world is full of mysteries—and some of the solar system's most extreme geology. Learn more about Earth's smaller, colder neighbor.