Encounter With Tiber
Buzz Aldrin
 9,000 years ago an alien society in the Alpha Centauri system was under threat of cosmic bombardment. Their only hope to survive was to explore and colonise nearby space. On 21st century Earth, astronauts find artifacts left by this civilisation and wonder who they were. The narrator is a historian who is part of a mission to the Alpha Centauri system, the home system of the aliens. As all crew members were required to bring several projects to work on, due to the decades long nature of the mission, she spends her time writing biographies of several family members who were closely involved in the acquisition of a repository of the alien's knowledge. As another project she translates two autobiographies by the aliens who had visited the Sol system some 9,000 years before.