What if you could make a change to history that would eliminate the Spanish Inquisition, American slavery, World War II, global warming, and an egomaniacal US president who thought he was smart enough to drop nuclear bombs here and there without negative consequences? What if that change also made the United States and five billion people poof from existence? Would you do it?

What if you could reach back in time to deport the world’s worst environmental villains to a depository planet before their greed condemns Earth to an ecological apocalypse? What if each time you did so, an alien instantly extracted a body part and replaced it with a refurbished one? Would you still do it?

Everyone has dreams of what they want to accomplish in life. Marty Essen’s childhood dream of becoming a herpetologist gave way to his dream of becoming a popular DJ, which led to his dream of becoming a big-time talent manager, which morphed into the dream of becoming an in-demand author and college speaker. While he achieved most of his dreams at various levels, he also realized that he didn’t necessarily have to reach the top to find success or happiness. Sometimes, “almost” is close enough.

Equipped with the entirety of human knowledge, a sentient ship is launched on a last-ditch journey to find a new home for civilization. Trillions of miles. Tens of thousands of years. In the space between, the AI has plenty of time to think about life, the vastness of the universe, everything it was meant to do, and—with a perspective created but not limited by humans—what it should do.

When postal worker Martin Briar is invited to partake in a secret time travel opportunity, he jumps at the chance to leave his dull life and step into the past. But he also has his own motivation for going back in time: the disappearance of his 12-year-old daughter two decades ago. Traveling to Denver in 1996 to investigate, he finds the world brimming with a different vibe: fewer skyscrapers, laid back people, a return to the life he once knew - a city on the verge of explosive growth.

Hackett, in his trusty ship the Perseus, is not just a space traveller—beginning his travels with an expedition to Neptune and back—but, thanks to the time-dilation effect, a time traveller as well. His new mission will take him to Andromeda, to get a close-up look at the constellation which will eventually crash into the Milky Way, and give humanity a heads-up about the challenges which are coming. A mission which will take him five million years to complete. Not only is Hackett exploring unknown space, but he will return to a vastly different time.

The Overlords appeared suddenly over every city - intellectually, technologically, and militarily superior to humankind. Benevolent, they made few demands: unify earth, eliminate poverty, and end war. With little rebellion, humankind agreed, and a golden age began.

When Finlay Ashowan joins the staff of the King and Queen of Daxaria, he’s an enigma. No one knows where he comes from or how he came to be where he is, which suits Fin just fine. He’s satisfied simply serving as the royal cook, keeping nosy passersby out of his kitchen, and concocting some truly uncanny meals. But Fin’s secret identity doesn’t stay hidden for long. After all, it’s not every day a house witch and his kitten familiar, Kraken, take to meddling in imperial affairs.

Dillon Mackey has always wanted to travel the stars.... When brilliant scientist and inventor Sherisza Rousilarru offers him an apprenticeship aboard her starship, he leaps at the chance to escape a boring future in the law.

They mustn't harm a human being, they must obey human orders, and they must protect their own existence...but only so long as that doesn't violate rules one and two. With these Three Laws of Robotics, humanity embarked on a bold new era of evolution that would open up enormous possibilities, and unforeseen risks.

Living and slaving in Fill City One, you get used to the smell. We call it the Everpresent Stink. But every once in a while, on a spring day with a breeze, it clears away enough to remind us that there is something more out there. Most Fillers' wildest dreams would be just to get past the walls and live in the mainland. But my dream? It’s a little bigger. I’m going to Mars.

Alexis Silver was ahead of her time, a woman too smart to fit into society at the turn of the century. She gave up her dreams of higher education for love, marrying young. But her husband, and the life she wanted, perished in World War I, soon after. Heartbroken and restless, she booked passage on a cruise along the West Coast in search of adventure, but adventure found her.

Quinn Black is having the worst day ever...over and over again. The same car blocking his driveway, the same horrific accident he witnesses, the same cop that keeps preventing him from saving his boss from dying in it, and the same memory of a girl from his past that gets sharper each time. Then he realizes he has the power to travel through time and change the future. Could he prevent terrorist attacks? Natural disasters? The deaths of friends? Before long, Quinn is thrust into the greatest race in human history.

Extensive training molded Bruce into a finely tuned mercenary. A man capable of scouring the galaxy to protect the innocent and vanquish the corrupt. An assignment to a distant outer system brings mystery, death, and mayhem. During his mission, a chance encounter with a stunning royal in a dimly lit bar results in all hell breaking loose. Save the damsel, figure out the mystery, and kill all the bad guys. If only saving humanity was that simple.

Logan Willis’s life is falling apart: he lost his job and found out that his wife is cheating on him all in the same day. Thinking that his world has ended, Logan checks into a hotel and turns on the TV to see that he's not far wrong - radio telescopes have detected mysterious signals coming from inside our solar system, and the source is moving toward us at over 500 miles per second. The media concludes that these signals must be of an alien origin. Still reeling from the news, Logan gets a phone call from his brother-in-law.

Living and slaving in Fill City One, you get used to the smell. We call it the Everpresent Stink. But every once in a while, on a spring day with a breeze, it clears away enough to remind us that there is something more out there. Most Fillers' wildest dreams would be just to get past the walls and live in the mainland. But my dream? It’s a little bigger. I’m going to Mars.

Cities all around the world reported strange alien vessels descending. Some saw them as the heralds of a new age; others fired everything they had at them. All were taken as the beams lashed down and drew them into the sky. Dean was left behind, seemingly the last man on Earth. A trail of clues left by his dead wife guides Dean on a perilous journey across America and beyond to learn the truth behind the mysterious ships and save humanity from its doom.

When prospector Bob Broadhead went out to Gateway on the Heechee spacecraft, he decided he would know which was the right mission to make him his fortune. Three missions later, now famous and permanently rich, Robinette Broadhead has to face what happened to him and what he is...in a journey into himself as perilous and even more horrifying than the nightmare trip through the interstellar void that he drove himself to take!

After slaying a leviathan of the deep, and gaining a magic he barely understands, an ordinary fisherman finds himself entangled in a magical game of the gods with the fate of his planet as the prize. Dean becomes Oakley's champion, competing in the Minotaur's Maze. He travels through a portal to Mixonia, a city of wonders, filled with magic and monster girls of all sorts. As he levels up in his noble quest to save his home world, he will earn and lose fortunes, rescue a bevy of beautiful babes, and protect the innocents of planet Oakley.

Pilot X is Ambassador of the Alendans, a race with the ability to move through space and time as guardians of the timeline. Locked in ongoing conflict with the Sensaurians, an organic hive mind that can send messages in thought throughout its own history, and the Progons, a machine race who can communicate backwards in time, Pilot X finally manages to create peace among the three races.

At the turn of the 22nd century, scientists make a breakthrough in human spaceflight. Through a revolutionary method known as somaforming, astronauts can survive in hostile environments off Earth using synthetic biological supplementations. With the fragility of the body no longer a limiting factor, human beings are at last able to journey to neighboring exoplanets long known to harbor life. A team of these explorers, Ariadne O’Neill and her three crewmates, are hard at work in a planetary system 15 light-years from Sol, on a mission to ecologically survey four habitable worlds.

Just why do humpback whales sing? That's the question that has marine behavioral biologist Nate Quinn and his crew poking, charting, recording, and photographing very big, wet, gray marine mammals - until the extraordinary day when a whale lifts its tail into the air to display a cryptic message spelled out in foot-high letters: Bite Me.

Higgens has the best job in the galaxy. Except for the fact that he’s technically a janitor on a galactic mining vessel. When he discovers an unknown alien species, his world gets turned upside down. He will have to find unlikely allies if he is going to save his new friend and help her build a new home. The Mimic and the Space Engineer boxed set contains the first three books in the Space Shifter Chronicles. If you like fast-paced space adventures with engaging, and quirky, characters, you will love Higgens, Mimic, and their adventures in space.

Humans call them Monument-Makers. An unknown race, they left stunning alien statues scattered on distant planets throughout the galaxy, encoded with strange inscriptions that defy translation. Searching for clues about the Monument-Makers, teams of 23rd century linguists, historians, engineers and archaeologists have been excavating the enigmatic alien ruins on a number of planets, uncovering strange, massive false cities made of solid rock. But their time is running out.

At his death in 1988, Robert A. Heinlein left a legacy that almost single-handedly defined modern science fiction. But one of Heinlein's masterpieces was never finished. In 1955, he began work on Variable Star, a powerful and passionate tale of two young lovers driven apart by pride, power, and the vastness of interstellar time and space. Now, the Heinlein estate has authorized award-winning author Spider Robinson to expand his outline into a full-length novel. And the result is vintage Heinlein.