NASA and Elon Musk are racing toward the same destination, but they are not running the same race. While SpaceX talks in terms of the next launch window, NASA is quietly building a layered campaign of ...

There are substantial technical, political, and financial obstacles to starting the colonization of Mars within the next few decades. SpaceX is farther along than most toward this ambitious goal.

When Philip K. Dick imagined artificial beings in his book "Do Androids Dream of Electric Sheep," the question was whether machines could think and feel like humans. Today, NASA is posing a related, ...