"What if?" questions stimulate people to think in new ways, to refresh old ideas, and to make new discoveries. In What If the Earth Had Two Moons, Neil Comins leads us on a fascinating ten-world journey as we explore what our planet would be like under alternative astronomical conditions. In each case, the Earth would be different, often in surprising ways. The title chapter, for example, gives us a second moon orbiting closer to Earth than the one we have now. The night sky is a lot brighter, but that won't last forever. Eventually the moons collide, with one extra-massive moon emerging after a period during which Earth sports a Saturn-like ring. This and nine and other speculative essays provide us with insights into the Earth as it exists today, while shedding new light on the burgeoning search for life on planets orbiting other stars. Appealing to adult and young adult alike, this book is a fascinating journey through physics and astronomy, and follows on the author's previous bestseller, What if the Moon Didn't Exist?, with completely new scenarios backed by the latest astronomical research.

This is the story of John, an average man in an average town, somewhere in England, but the events that unfold, just happened to happen to John, who is cursed with the knowledge that there is more to life. Knowledge for some is a blessing, but for others, with no hope of change, stuck in a meaningless existence, it’s a curse. After all, ignorance is bliss.... isn’t it? Until one winter’s morning, he wakes up for another early morning shift. Thinking he’s late, he rushes down stairs and out the door, but this is where his adventure begins. For instead of stepping out into a cold winter’s morning, he finds himself waking to the sun beating down hard on his back. He is in the middle of a desert, how he got there, he has no idea, and where here is, is the biggest mystery of all. Which will take him on an adventure, across strange lands and places, seeing even stranger animals, and making friends with people and creatures, he couldn’t have imagined. Some of which would travel with him, showing and sharing some of the wonders along the way, in these strange yet sometimes dark and marvellous lands, as he searches for answers.

An astonishing exploration of planet formation and the origins of life by one of the world’s most innovative planetary geologists. In 1959, the Soviet probe Luna 3 took the first photos of the far side of the moon. Even in their poor resolution, the images stunned scientists: the far side is an enormous mountainous expanse, not the vast lava-plains seen from Earth. Subsequent missions have confirmed this in much greater detail. How could this be, and what might it tell us about our own place in the universe? As it turns out, quite a lot. Fourteen billion years ago, the universe exploded into being, creating galaxies and stars. Planets formed out of the leftover dust and gas that coalesced into larger and larger bodies orbiting around each star. In a sort of heavenly survival of the fittest, planetary bodies smashed into each other until solar systems emerged. Curiously, instead of being relatively similar in terms of composition, the planets in our solar system, and the comets, asteroids, satellites and rings, are bewitchingly distinct. So, too, the halves of our moon. In When the Earth Had Two Moons, esteemed planetary geologist Erik Asphaug takes us on an exhilarating tour through the farthest reaches of time and our galaxy to find out why. Beautifully written and provocatively argued, When the Earth Had Two Moons is not only a mind-blowing astronomical tour but a profound inquiry into the nature of life here—and billions of miles from home.

Demonstrates how ten hypothetical situations would affect our planet and life on it. Topics include: what if the moon didn't exist, what if earth were tilted like Uranus, what if a black hole passed through earth, and so on.

Advance praise for Philip Plait s Bad Astronomy "Bad Astronomy is just plain good! Philip Plait clears up everymisconception on astronomy and space you never knew you sufferedfrom." --Stephen Maran, Author of Astronomy for Dummies and editorof The Astronomy and Astrophysics Encyclopedia "Thank the cosmos for the bundle of star stuff named Philip Plait,who is the world s leading consumer advocate for quality science inspace and on Earth. This important contribution to science willrest firmly on my reference library shelf, ready for easy accessthe next time an astrologer calls." --Dr. Michael Shermer,Publisher of Skeptic magazine, monthly columnist for ScientificAmerican, and author of The Borderlands of Science "Philip Plait has given us a readable, erudite, informative,useful, and entertaining book. Bad Astronomy is Good Science. Verygood science..." --James "The Amazing" Randi, President, JamesRandi Educational Foundation, and author of An Encyclopedia ofClaims, Frauds, and Hoaxes of the Occult and Supernatural "Bad Astronomy is a fun read. Plait is wonderfully witty andeducational as he debunks the myths, legends, and 'conspiraciesthat abound in our society. 'The Truth Is Out There' and it's inthis book. I loved it!" --Mike Mullane, Space Shuttle astronaut andauthor of Do Your Ears Pop in Space?

Previously published by Del Rey Books as two separate novels--"Inherit the Stars" and "The Gentle Giants of Ganymede"--these two stories, now available in one volume, began Hogan's legendary Giants series and the career of a major SF talent.

From writer Stacy McAnulty and illustrator Stevie Lewis, Moon! Earth's Best Friend is a light-hearted nonfiction picture book about the formation and history of the moon—told from the perspective of the moon itself. Meet Moon! She's more than just a rock—she’s Earth’s rock, her best friend she can always count on. Moon never turns her back on her friend (literally: she's always facing Earth with the same side!). These two will stick together forever. With characteristic humor and charm, Stacy McAnulty channels the voice of Moon in this next celestial "autobiography" in the Our Universe series. Rich with kid-friendly facts and beautifully brought to life by Stevie Lewis, this is an equally charming and irresistible companion to Earth! My First 4.54 Billion Years and Sun! One in a Billion.

Three stunning works of science fiction from the Hugo and Nebula Award–winning grandmaster and author of Way Station. I Am Crying All Inside and Other Stories: Ten stories of mystery and imagination in a world that cannot be, full of plant-based intelligence, robots, aliens, and time-travelers. Includes “I Had No Head and My Eyes Were Floating Way Up in the Air,” originally written for Harlan Ellison’s The Last Dangerous Visions.™ Highway of Eternity: The Evans family is hiding in eighteenth-century England from dangerous aliens from the future when they’re discovered by secret agent Jay Corcoran. Now they all must race for survival through space and time—but it’s easier said than done when monstrous beasts, killer robots, and immortal body-destroyers are waiting at every juncture. Project Pope: Sentient robots on the remote planet End of Nothing are working to create a truly universal religion presided over by a pope, a supercomputer fed knowledge by telepathic humans. But everything could be compromised when one of the humans claims she’s found Heaven . . .

Contains 250 questions and answers about astronomy, particular for the amateur astronomer.

The Starship Praihawk and it's crew are being hunted. Lost and stranded in an unknown galaxy, the crew land on an alien planet where Bohai's powers soon lead the locals to mistake him for an ancient mythic warrior. Now the crew are revered by some and hated by others. Many new enemies are upon them and their only new ally is a robot programmed not to help them. And one warlord won't stop until Bohai is dead. Now a team of four: ☼ Sam's DNA gives him electrical powers ☼ Bohai can speak to creatures ☼ Kiran has the strength of 3 men ☼ Teak is a giant spider, expert at stealth They are cut off from Earth, outnumbered and running out of options. Soon they must face their new enemies in a battle to the death. — The thrilling sequel to Hidden Planet and the next installment of the Angry Galaxy series. "A fast-paced space adventure!" From the author of The Whisper Killer, Hidden Planet, The Last Starbase and Earthweeds.