With the help of her "Uncle" Calum, Acorna sets off to find her people, a gentle folk who mind-speak by touching horns.

John has fallen through a forgotten door to the strange planet Earth and is in great danger. Soon the family who befriends him is in great danger too. Time is running out. He must find the secret passage quickly or he may never get home.

When Gyre Price lied her way into this expedition, she thought she'd be mapping mineral deposits and the greatest dangers might be cave collapses and gear malfunctions. She also thought the fat paycheck meant she'd get a skilled surface team monitoring her suit and environment, keeping her safe. Keeping her sane. Instead, she got Em. Em sees nothing wrong with controlling Gyre's body with drugs or withholding critical information to "ensure the smooth...

When the residents of a far-distant planet send a message to Earth asking for someone to meet with them, the President of the United States asks Stanley Lambchop, an all-American boy, to be his ambassador.

When Mrs. Green announces that a new student from far away is joining their class, her students worry that he may be a giant chicken, a bionic turnip, a body snatcher, or even from Mars.

Our neighboring planets may have the answer to this question. Scientists have already identified ice caps on Mars and what appear to be enormous oceans underneath the ice of Jupiter's moons. The atmosphere on Venus appeared harsh and insupportable of life, composed of a toxic atmosphere and oceans of acid -- until scientists concluded that Earth's atmosphere was eerily similar billions of years ago. An extraterrestrial colony, in some form, may...

Explores the history of the search for extraterrestrials and presents three contrasting views of how life began.

The Animorphs and Ax have allies willing to fight against the Yeerk invasion now that Andalites have finally arrived on earth. But there are only four of them and they don't want to fight alongside humans. Ax must choose a side. His friends? His people?

With the planet's fighting men and women deployed across the galaxy-battling in the noble cause of enslaved humanity-the insidious Xul have reached across space to devastate the unsuspecting Earth with asteroid fire. Without warning, a once majestic world is reduced to near-rubble-and the very future of humankind is in dire jeopardy. Interplanetary leaders are on the brink of abandoning Earth and its colonies to an overwhelming enemy. But Brigadier...

Psychiatrist Gene Brewer doesn't have a diagnosis for the mysterious new patient who calls himself "prot" (rhymes with goat). But, this strange and likeable man cannot be, as he claims, from the planet K-PAX. Or, can he? Prot knows facts about space that are confounding the experts. He is soon revealing Dr. Brewer's own deepest pains and most sublime longings. And, his tales of K-PAX have other patients competing to go along with him when he heads...