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1.
Fictional race described in Frederik Pohl's Sci-Fi novels. Starfaring and technologically advanced. Nothing is known or described about their physical appearance.

Mankind only encounters ruins and artifacts of the now exctinct Heechee, thus uncovering pieces of evidence for the history of the universe.
Heechee artifacts sell for a high price due to their rarity.
by Starfyre June 23, 2005