When Elon Musk founded SpaceX (which is currently one of the most valuable private companies in the world), he did so with the dream of setting up colonies on Mars. A lofty goal, mostly because we've ...

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 ...

When Elon Musk announced that he was taking SpaceX public with an initial public offering that would give the rocket company a $1.5 trillion valuation, shock waves erupted across the commercial space ...

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.