Abstract
It was lurking out there, astronomers said. Our sun's evil companion, invisible, dark, like a stealthy general of an enemy force, wandered in hiding, waiting for the next opportunity to order its agents death into combat. Its name was Nemesis. Every 27 million years, using its gravity, it sent comets from the Oort Cloud, like special forces, toward the earth, bombarding the doomed planet's helpless inhabitants into fiery cauldrons of mass death.