1) Science fiction book series
Found on
https://www.crosswordclues.com/clue/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 that explored Earth`s solar system millennia ago and then disappeared without a trace before humankind began space exploration. The Heechee first appeared in `The Merchants of Venus` (......
Found on
http://en.wikipedia.org/wiki/Heechee
No exact match found.
