Across a Billion Years Author:Robert Silverberg TOR Books (c) 1969 — Publication date December 1983 — Scattered throughout the globe of human-occupied space is evidence of a civilization that bestrode the galaxy before humanity was born. Now, a strange device has been discovered that shows the details of that great civilization. The details include a star map and hints that the High Ones are no... more »t extinct after all. The map beckons, and humans, being what they are, will follow. To the next great step in human destiny - or ultimate disaster.« less
This is a paperback book. I just finished reading it. It is very good "hard" science fction with believable aliens, a good plot, and interesting settings and relationships between characters.
If you could picture an story that combines the archaeology of Indiana Jones and the wayfaring adventures of Star Trek, this gem from Rovert Silverberg would be it. The characters in the book excavate and extrapolate information for archaeological sites on far away worlds, in an attempt to discover the oldest civilizations in the universe.
When an excavation leads them to discoveries that predate those of the known galaxy, they also discover truths about the beginning and the end of time!
A quick read, and a fascinating combination of the past and the future!