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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. 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.

  5. Extraterrestrial life - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial_life

    Besides, even if there is an advanced extraterrestrial civilization, there is no guarantee that it is transmitting radio communications in the direction of Earth. The length of time required for a signal to travel across space means that a potential answer may arrive decades or centuries after the initial message. [98]

  6. 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.

  7. 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.

  8. 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 ...

  9. Worldbuilding - Wikipedia

    en.wikipedia.org/wiki/Worldbuilding

    Worldbuilding is the process of constructing an imaginary world or setting, sometimes associated with a fictional universe. [1] Developing the world with coherent qualities such as a history, geography, culture and ecology is a key task for many science fiction or fantasy writers. [2]

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