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  2. Semper Mars - Wikipedia

    en.wikipedia.org/wiki/Semper_Mars

    Semper Mars: Book One of the Heritage Trilogy is a military science fiction novel by American writer Ian Douglas. It is the first novel in the Heritage Trilogy . Plot introduction

  3. Heritage Trilogy - Wikipedia

    en.wikipedia.org/wiki/Heritage_Trilogy

    The events of the Heritage Trilogy span from 2040 to 2067. In Semper Mars, evidence of an alien civilization that may have intervened in human evolution threatens to throw the Earth into chaos and war when discovered by scientists in the subterranean ruins on Mars.

  4. Extraterrestrial life - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial_life

    Popular belief in thriving alien civilisations elsewhere in the solar system still remained strong until Mariner 4 and Mariner 9 provided close images of Mars, which debunked forever the idea of the existence of Martians and decreased the previous expectations of finding alien life in general. [141]

  5. The Milky Way is probably full of dead alien civilizations ...

    www.aol.com/milky-way-probably-full-dead...

    It turns out the Milky Way may have once been full of bustling alien civilizations, but they are all dead now. The paper, which is a preprint and awaiting peer review, amounts to an update to the ...

  6. Xenoarchaeology - Wikipedia

    en.wikipedia.org/wiki/Xenoarchaeology

    Xenoarchaeology, a branch of xenology dealing with extraterrestrial cultures, is a hypothetical form of archaeology that exists mainly in works of science fiction. The field is concerned with the study of the material remains to reconstruct and interpret past life-ways of alien civilizations.

  7. Silurian hypothesis - Wikipedia

    en.wikipedia.org/wiki/Silurian_hypothesis

    The hypothesis also speculates that artifacts from past civilizations could be found on the Moon and Mars, where erosion and tectonic activity are less likely to erase evidence. The concept of pre-human civilizations has been explored in popular culture, including novels, television shows, short stories, and video games.

  8. Richard C. Hoagland - Wikipedia

    en.wikipedia.org/wiki/Richard_C._Hoagland

    Richard Charles Hoagland (born April 25, 1945) is an American author and a proponent of various conspiracy theories about NASA, lost alien civilizations on the Moon, and on Mars and other related topics.

  9. Five themes of geography - Wikipedia

    en.wikipedia.org/wiki/Five_themes_of_geography

    Most American geography and social studies classrooms have adopted the five themes in teaching practices, [3] as they provide "an alternative to the detrimental, but unfortunately persistent, habit of teaching geography through rote memorization". [1] They are pedagogical themes that guide how geographic content should be taught in schools. [4]