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Baris 4: Istilah ini kemungkinan berasal dari karya [[Carl Sagan]], ''Contact'' (hal. 306) dan ''Billions and Billions'' (hal. 135).<ref>{{cite book\|last = Sagan\|first = Carl\|authorlink = Carl Sagan\|coauthors =\|title = Contact \|publisher = Orbit\|date = 1997\|location =\|pages = 432\|url = \|doi =\|isbn = 1857235800 }}</ref><ref>{{cite book\|last = Sagan \|first = Carl\|authorlink = Carl Sagan\|coauthors =\|title = Billions and Billions: Thoughts on Life and Death at the Brink of the Millennium\|publisher = Ballantine Books\|date = 1998\|location =\|pages = 320\|url = \|doi =\|isbn = 0345379187 }}</ref> == Catatan kaki ==

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