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  2. Wow! signal - Wikipedia

    en.wikipedia.org/wiki/Wow!_signal

    The Wow! signal represented as "6EQUJ5". The original printout with Ehman's handwritten exclamation is preserved by Ohio History Connection. [1]The Wow! signal was a strong narrowband radio signal detected on August 15, 1977, by Ohio State University's Big Ear radio telescope in the United States, then used to support the search for extraterrestrial intelligence.

  3. Search for extraterrestrial intelligence - Wikipedia

    en.wikipedia.org/wiki/Search_for...

    The search for extraterrestrial intelligence (SETI) is a global scientific effort to detect extraterrestrial signals, or evidence of intelligent life beyond earth.. Researchers use methods such as monitoring electromagnetic radiation, searching for optical signals, and investigating potential extraterrestrial artifacts for any signs of transmission from civilizations present on othe

  4. Fermi paradox - Wikipedia

    en.wikipedia.org/wiki/Fermi_paradox

    This is an accepted version of this page This is the latest accepted revision, reviewed on 8 February 2025. Discrepancy of the lack of evidence for alien life despite its apparent likelihood This article is about the absence of clear evidence of extraterrestrial life. For a type of estimation problem, see Fermi problem. Enrico Fermi (Los Alamos 1945) The Fermi paradox is the discrepancy ...

  5. NASA offers explanation for bizarre 'trumpet noise' phenomena

    www.aol.com/news/2015-05-22-nasa-attempts-to...

    Since this still lacks scientific confirmation, rampant speculation continues about potential extra-terrestrial theories for these "trumpet noises." But don't count NASA as a UFO-doubter just yet.

  6. List of reported UFO sightings - Wikipedia

    en.wikipedia.org/wiki/List_of_reported_UFO_sightings

    List of alleged extraterrestrial beings – A list of entities reported in conjunction with UFOs and believed by witnesses to be alien in origin, unrelated to astrobiology or xenobiology. List of UFO religions; List of investigations of UFOs by governments; List of UFO organizations – Private organizations that investigate UFO sightings.

  7. Astronomical radio source - Wikipedia

    en.wikipedia.org/wiki/Astronomical_radio_source

    As the nearest star, the Sun is the brightest radiation source in most frequencies, down to the radio spectrum at 300 MHz (1 m wavelength). When the Sun is quiet, the galactic background noise dominates at longer wavelengths.

  8. List of unexplained sounds - Wikipedia

    en.wikipedia.org/wiki/List_of_unexplained_sounds

    The following is a list of unidentified, or formerly unidentified, sounds.All of the NOAA sound files in this article have been sped up by at least a factor of 16 to increase intelligibility by condensing them and raising the frequency from infrasound to a more audible and reproducible range.

  9. Radio atmospheric signal - Wikipedia

    en.wikipedia.org/wiki/Radio_atmospheric_signal

    In addition, technical noise from electric motors, ignition systems of motor cars, etc., are superimposed. Finally, beyond the high frequency band (3–30 MHz) extraterrestrial noise (noise of galactic origin, solar noise) dominates. [2] [3] The atmospheric noise depends on frequency, location and time of day and year.