How would colonizing Mars alter us physically and mentally? Would permanent residence on the red planet make us somehow less ...

Elon Musk is putting his dreams of colonizing Mars on hold and said his SpaceX rocket company will instead focus on building a city on the moon.

For decades, the idea of people living on Mars has felt like a distant fantasy, limited by the brutal cost of hauling everything from Earth and the difficulty of building safe shelters on a hostile ...