In 1988 Todd discovered the secret of time travel from his step brother Jeff. Together they traveled to the Fourth Dimension where they met a species made of en

This is a critical time for the space program, and for all of us. Even the significant steps that we have taken since the dawn of the space age in 1957, includi

Is there life beyond Earth? NASA astrobiologist Dr. Chris McKay has searched the earth's most extreme environments on his quest to understand what factors are n

We are at the cusp of a golden age in space science, as increasingly more entrepreneurs—Elon Musk, Richard Branson, Jeff Bezos—are seduced by the commercial

An engaging account of our quest for habitable environments, recounting fascinating recent discoveries and providing insight into future space missions.