At nearly fifteen years of age, Joey Harker learns that he is a Walker, able to travel between dimensions, and soon joins a team of different versions of himself, each from another dimension, to fight the evil forces striving to conquer all the worlds.

Offers a vision of our universe and beyond, all beginning with a simple question: Why does time move forward?

At the moment when Voyager 1 is launched into space carrying its famous golden record, a baby of unusual perception is born to a single mother in Philadelphia. Adina Giorno is tiny and jaundiced, but reaches for warmth and light. As a child, she recognizes that she is different; she also possesses knowledge of a faraway planet. The arrival of a fax machine enables her to contact her extraterrestrial relatives, beings who have sent her to report on...

In this vibrant, eye-opening tour of milestones in the history of our universe, Chris Impey guides us through space and time, leading us from the familiar sights of the night sky to the dazzlingly strange aftermath of the Big Bang.-- Publisher.

Aided by the journal of a young woman who lived in nineteenth-century France, Nina solves a murder mystery dormant since the time of Napoleon.

America's most celebrated astrophysicist invites young readers to explore the mysteries of the universe.

Londons fall and kingdoms rise while darkness sweeps the Maresh Empire, and the fraught balance of magic blossoms into dangerous territory while heroes struggle.

As Arthur Penhaligon seeks to find the seventh key, complete his quest to save the Kingdom to which he is heir, and learn his true identity, he discovers that he has a greater purpose than he could have imagined.