Voyagers Series by Ben Bova

Ex-astronaut turned physicist Keith Stoner knows the signals picked up at his space station are not random. The message is heading straight for Earth, and Stoner will do anything to be the first man to confront the enigma, even if he loses his only love.

When Keith Stoner awoke, he found himself in a world changed almost beyond recognition. Eighteen years before, Stoner had been the American member of a joint U.S.-Soviet mission to capture an alien ship. The Soviets had to pull out, but Stoner persisted, and while on the strange ship, he fell into suspended animation. Jo Camerata, the ambitious young student who fell in love with Stoner, is now head of Vanguard Industries, which has recovered the alien ship... moreWhen Keith Stoner awoke, he found himself in a world changed almost beyond recognition. Eighteen years before, Stoner had been the American member of a joint U.S.-Soviet mission to capture an alien ship. The Soviets had to pull out, but Stoner persisted, and while on the strange ship, he fell into suspended animation. Jo Camerata, the ambitious young student who fell in love with Stoner, is now head of Vanguard Industries, which has recovered the alien ship. As a result, her company is now in control of its vast new technology and the fortune it reaps—and in control of Keith Stoner. What Camerata doesn't know, however, is that someone else has been awake, someone who dwells within Stoner's mind. The alien presence that has kept Stoner alive all this time is now free and intends to explore our world, letting nothing stand in its way. less

Keith Stoner lay frozen in an alien spacecraft for fifteen long years; during that time he came to be something more than just an astronaut, just a man. Stoner became partly alien hismelf--merged with an alien intelligence embodied in the nanotechnology that lived inside Stoner's body.The alien whose tomb that spacecraft was, brought humanity both a blessing and a deadly peril. The technology now the control of Vanguard Industries has changed the face of the earth... moreKeith Stoner lay frozen in an alien spacecraft for fifteen long years; during that time he came to be something more than just an astronaut, just a man. Stoner became partly alien hismelf--merged with an alien intelligence embodied in the nanotechnology that lived inside Stoner's body.The alien whose tomb that spacecraft was, brought humanity both a blessing and a deadly peril. The technology now the control of Vanguard Industries has changed the face of the earth. The technology that lives in Stoner's bloodstream will change mankind forever.There are powerful leaders, both corporate and political, who are becoming aware of Keith Stoner and the power he seems to control. They want that power for themselves, and will do anything to gain it. Nothing Stoner can say or do will convince these ruthless men and women that the power they seek may destroy them utterly. less

In the 1980s, an alien starship visited Earth. While investigating what appeared to be a sarcophagus bearing the preserved body of its builder, astronaut Keith Stoner was trapped and cryogenically frozen. After his body was eventually returned to Earth and revived, Stoner discovered that he had acquired alien powers. Using these new powers, he built a new starship and left Earth... moreIn the 1980s, an alien starship visited Earth. While investigating what appeared to be a sarcophagus bearing the preserved body of its builder, astronaut Keith Stoner was trapped and cryogenically frozen. After his body was eventually returned to Earth and revived, Stoner discovered that he had acquired alien powers. Using these new powers, he built a new starship and left Earth.Now, after more than a century of exploring the stars, Keith Stoner returns to find that the world he has come back to does not match the one he left. The planet is suffering the consequences of disastrous greenhouse flooding. Most nations have been taken over by ultraconservative religion-based governments, such as the New Morality in the United States. With population ballooning and resources running out, Earth is heading for nuclear war. Stoner, the star voyager, wants to save Earth’s people. But first he must save himself from the frightened and ambitious zealots who want to destroy this stranger—and the terrifying message he brings from the stars. less