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, ...

Near the start of the 20th century, a strange phenomenon swept the country — "Mars Mania," a public obsession with the idea, pushed by astronomer Percival Lowell, that Mars was home to an intelligent ...

Decades before modern rovers ever reached Mars, NASA scientists were already imagining permanent human colonies on the red planet. The plan involved reshaping Mars itself, warming the planet and ...