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- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_1e_(OpenStax)/30%3A_Life_in_the_Universe/30.04%3A_The_Search_for_Extraterrestrial_IntelligenceSome astronomers are searching for extraterrestrial intelligent life (SETI). Because other planetary systems are so far away, traveling to the stars is either very slow or extremely expensive (in term...Some astronomers are searching for extraterrestrial intelligent life (SETI). Because other planetary systems are so far away, traveling to the stars is either very slow or extremely expensive (in terms of energy required). Despite many UFO reports and tremendous media publicity, there is no evidence that any of these are related to extraterrestrial visits. If we do find a signal someday, deciding whether to answer and what to answer may be two of the greatest challenges humanity will face.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_2e_(OpenStax)/30%3A_Life_in_the_Universe/30.05%3A_The_Search_for_Extraterrestrial_IntelligenceSome astronomers are searching for extraterrestrial intelligent life (SETI). Because other planetary systems are so far away, traveling to the stars is either very slow or extremely expensive (in term...Some astronomers are searching for extraterrestrial intelligent life (SETI). Because other planetary systems are so far away, traveling to the stars is either very slow or extremely expensive (in terms of energy required). Despite many UFO reports and tremendous media publicity, there is no evidence that any of these are related to extraterrestrial visits. If we do find a signal someday, deciding whether to answer and what to answer may be two of the greatest challenges humanity will face.
- https://phys.libretexts.org/Courses/Grossmont_College/ASTR_110%3A_Astronomy_(Fitzgerald)/15%3A_Life_in_the_Universe/15.04%3A_The_Search_for_Extraterrestrial_IntelligenceSome astronomers are searching for extraterrestrial intelligent life (SETI). Because other planetary systems are so far away, traveling to the stars is either very slow or extremely expensive (in term...Some astronomers are searching for extraterrestrial intelligent life (SETI). Because other planetary systems are so far away, traveling to the stars is either very slow or extremely expensive (in terms of energy required). Despite many UFO reports and tremendous media publicity, there is no evidence that any of these are related to extraterrestrial visits. If we do find a signal someday, deciding whether to answer and what to answer may be two of the greatest challenges humanity will face.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Supplemental_Modules_(Astronomy_and_Cosmology)/Astronomy/Life_beyond_the_Earth/The_Drake_EquationThe census of stars by the Kepler mission has shown that at least 70% of ordinary stars including those hotter than the Sun and the great majority cooler than the Sun have a planet of some size orbiti...The census of stars by the Kepler mission has shown that at least 70% of ordinary stars including those hotter than the Sun and the great majority cooler than the Sun have a planet of some size orbiting them (the percentage will only increase as the Kepler team continues processing the data).
