Harvard’s top astronomer lays out his controversial theory that our solar system was recently visited by advanced alien technology from a distant star....

This landmark book is for those of us who prefer words to equations; this is the story of the ultimate quest for knowledge, the ongoing search for the secrets at the heart of time and space....

In Black Holes, Tides, and Curved Spacetime, you will travel to the very edges of modern physics to explore several revolutionary theories and discover that physics is just as exciting today as it was when Newton sat by that fateful apple tree....

There was a time when “universe” meant all there is. Everything....

Stephen Hawking not only unraveled some of the universe's greatest mysteries but also believed science plays a critical role in fixing problems here on Earth. Now, as we face immense challenges on our planet, he turns his attention to the most urgent issues facing us ....

A concise, elegant exploration of time from the author of the international best seller, Seven Brief Lessons on Physics....

From the development of the U-2 to the Stealth fighter, the never-before-told story behind America's high-stakes quest to dominate the skies....

A breathtaking and beautiful exploration of our planet, this groundbreaking audiobook accompanies the BBC One TV series, providing the deepest answers to the simplest questions....

One of the most influential thinkers of our time, Stephen Hawking is an intellectual icon, known not only for the adventurousness of his ideas...

From one of our finest and most popular science writers, the best-selling author of Your Inner Fish, comes the answer to a scientific mystery story as big as the world itself....

As recently as 1990, it seemed plausible that the solar system was a unique phenomenon in our galaxy....

Visionary Activist Astrology escorts you through the mists of time to our own century, when science has verified what ancient people knew instinctively....