What might we run into as we expand beyond Earth and into the stars? As we explore our own solar system and beyond, it seems inevitable that we'll run into aliens … and what they've left behind. Alien artifacts: what might they reveal about us as we try to unlock their secrets? What might they reveal about the universe? In this anthology, nineteen of today's leading science fiction and fantasy authors explore how discovering long lost relics of alien civilizations might change humanity. J