The Earth is embraced by its oceans and seas. And so are we. We depend on them for more than half of the oxygen we breathe. Ocean currents shape the slow march of climate and the daily changes of our ...

Using carefully selected terrestrial rocks, engineers try to figure out how to work with crumbly rocks like the one the rover encountered on its first sampling attempt. Using carefully selected ...

On Earth, solar power is at the mercy of clouds and nighttime. But in space, the thinking goes, you could have virtually unmitigated access to direct sunlight. Of course, the cost and efficiency of ...