Tau Zero

by Poul Anderson · 1970

When the interstellar vessel Leonora Christine launches from Earth, fifty scientists, engineers, and explorers know they will spend only a few years aboard while decades race by on the home world. Their mission: to reach a habitable planet thirty light‑years away. But a collision with an uncharted dust cloud shatters the ship’s deceleration system, forcing the crew to accelerate ever closer to light speed. As the vessel approaches tau‑zero, time dilates beyond imagination—galaxies flash by in the blink of an eye and centuries unfold outside while the crew ages only months. Against this relentless physics, Anderson weaves a gripping human drama. The crew must preserve hope, order, and purpose as their world shrinks to a self‑contained society, confronting love, loss, and the meaning of eternity. "Tau Zero" blends hard‑science rigor with deep emotional resonance, delivering an unforgettable odyssey that asks what humanity becomes when the universe itself becomes the journey.