Joe W Haldeman

Drafted into the ranks of Earth's interstellar warriors, private William Mandella finds his fight against the Taurans secondary to the side-effects of faster-than-light space travel, which affects the rate at which he ages.

After spending six years travelling to a distant solar system that is home to the enigmatic, powerful race known as "The Others, " in the hopes of finding enough common purpose between their species to forge a delicate truce, Carmen Dula and her husband return to Earth to find a massive flotilla of warships defending Earth against The Others. But The Others have more power than any could imagine--and they will brook no insolence from the upstart human...

Young Carmen Dula and her family are about to embark on the adventure of a lifetime--they're going to Mars. Once on the Red Planet, however, Carmen realizes things are not so different from Earth. There are chores to do, lessons to learn, and oppressive authority figures to rebel against. And when she ventures out into the bleak Mars landscape alone one night, a simple accident leads her to the edge of death until she is saved by an angel--an angel...

Working as a lowly research assistant at MIT, Matt Fuller is working on a project to measure quantum forces related to time changes in gravity and electromagnetic force, when his calibrator is transformed into a time machine.