Note: Those literary critics who rail upon works with multiple prologues are invited to consider that sometimes what looks like two prologues is really just one prologue with two chapters, so it's okay, and besides, it probably was the best way to tell the story.
NARRATOR: More Prologue: Hrathor system, fifty four million years ago...
(unknown): A hundred worlds?
(unknown 2): More like a hundred thousand worlds, including many planet-sized starships.
(unknown 2): Their mega-civilization spanned the galaxy for nearly twenty thousand years.
(unknown 2): The M-civ dig sites were all abandoned within a few centuries of each other... nineteen million years ago.
(unknown): Where did everyone go?
(unknown 2): A better question is "Why did they all disappear at the same time?"
(unknown): Oh. Okay, what have you learned?
(unknown 2): Xenoarcheology is a deeply disturbing field of study.