Heechee

The Heechee are a fictional alien race from the science fiction works of Frederik Pohl. The Heechee are portrayed as an exceedingly advanced star-travelling race from the past history of the Galaxy, before humankind began space explorations. The books are primarily concerned with human study of Heechee artifacts.

The novels include:

• Gateway (1977)
• Beyond the Blue Event Horizon (1980)
• Heechee Rendezvous (1984)
• Annals of the Heechee (1987)
• The Gateway Trip (1990)