For more than a century, popular culture has promised that humanity will spread effortlessly across the Solar System, turning Mars into a second Earth and building floating cities above Venus. The ...

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, ...

Decades before modern rovers ever reached Mars, NASA scientists were already imagining permanent human colonies on the red ...