Search for extraterrestrial intelligence

American astrophysicist, cosmologist and author (1934–1996)

British science fiction writer, inventor, and futurist (1917–2008)

alt=Timelapse of exoplanets orbit motion|thumb|upright=1.5|Four exoplanets of the HR 8799 system imaged by the [[W. M. Keck Observatory over the course of seven years. Motion is interpolated from annual observations.]] thumb|295x295px|Comparison of the size of exoplanets orbiting Kepler-37 to Mercury, Mars and Earth An exoplanet or extrasolar planet is a planet outside of the Solar System. The first confirmed detection of an exoplanet was in 1992 around a pulsar, and the first detection around a main-sequence star was in 1995. A different planet, first detected in 1988, was confirmed in 2003.

life that does not originate from Earth

apparent contradiction between the lack of evidence and high probability estimates for the existence of extraterrestrial civilizations

zone around the star with strong possibilities for stable liquid water and evolution of life

effort to find civilizations not from Earth

probabilistic argument to estimate the number of alien civilizations in our galaxy

hypothetical megastructure, originally described by Freeman Dyson

two phonograph records included on both Voyager spaceprobes launched in August and September 1977

American astronomer and astrophysicist (1930–2022)

1974 message into space

1977 narrowband radio signal from SETI

Proposed scale by which the scope of a civilisation might be measured

observatory located in the municipality of Arecibo, Puerto Rico

plaque attached to the Pioneer 10 and Pioneer 11 spacecraft in case extraterrestrial life finds them

binary system in the constellation Cygnus

radio telescope located in Pingtang County, Guizhou Province, China

Soviet and Russian astronomer

Soviet astronomer (1916–1985)

SETI@home ("SETI at home") is a project of the Berkeley SETI Research Center to analyze radio signals with the aim of searching for signs of extraterrestrial intelligence. Until March 2020, it was run as an Internet-based public volunteer computing project that employed the BOINC software platform. It is hosted by the Space Sciences Laboratory at the University of California, Berkeley, and is one of many activities undertaken as part of the worldwide SETI effort.

American astronomer

high-energy astrophysical phenomenon manifested as a transient radio pulse lasting only a few milliseconds

A biosignature is a phenomenon that can be explained by biological processes where all possible abiotic causes of this phenomenon have been eliminated. This term is mainly used in the field of astrobiology in the search for past or present extraterrestrial life, from planets and moons in the Solar System to exoplanets. Candidate biosignatures strongly indicate some of the earliest known life forms, aid studies of the origin of life on Earth as well as the possibility of life on Mars, Venus and elsewhere in the universe.

Israeli astrophysicist (1962-)

pulsar in the constellation Vulpecula

constructed language

hypothesis that alien life has not been discovered because alien civilizations are silent and very cautious

theory regarding lack of alien contact

former radio telescope in the municipality of Arecibo, Puerto Rico

American astrophysicist (1915–2005)

novel by Carl Sagan

1960 SETI experiment

American attorney and politician

philosophical concept

U.S.-based not-for-profit research organization for astrobiology and outreach (1984–)

radio telescope

set of programs to search for and communicate with extraterrestrial intelligence

initiative to search for intelligent extraterrestrial life

radio telescope that received the "Wow!" signal

SHGb02+14a is an astronomical radio source and a candidate in the Search for Extra-Terrestrial Intelligence (SETI), discovered in March 2003 by SETI@home and announced in New Scientist on September 1, 2004.

attempt to send messages to intelligent extraterrestrials

thumb|400px|Illustration of various types of technosignatures Technosignature or technomarker is any measurable property or effect that provides scientific evidence of past or present technology. Technosignatures are analogous to biosignatures, which signal the presence of life, whether intelligent or not. Some authors prefer to exclude radio transmissions from the definition, but such restrictive usage is not widespread. Jill Tarter has proposed that the search for extraterrestrial intelligence (SETI) be renamed "the search for technosignatures". Various types of technosignatures, such as rad

thumb|upright|Parkes Observatory that detected BLC-1

astronomer

proposed SETI measurement

g-type star located in the constellation of Hercules

Russian astronomer

communication between planetary systems

SETI project

idea that any intelligent life is destroyed by aliens

American physicist

CTA 102, also known by its B1950 coordinates as 2230+114 (QSR B2230+114) and its J2000 coordinates as J2232+1143 (QSO J2232+1143), is a blazar-type quasar discovered in the early 1960s by a radio survey carried out by the California Institute of Technology. It has been observed by a large range of instruments since its discovery, including WMAP, EGRET, GALEX, VSOP and Parkes, and has been regularly imaged by the Very Long Baseline Array since 1995. It has also been detected in gamma rays, and a gamma-ray flare has been detected from it.

Australian scientist (1921–2007)

American stellar astronomer

SERENDIP (Search for Extraterrestrial Radio Emissions from Nearby Developed Intelligent Populations) is a Search for Extra-Terrestrial Intelligence (SETI) program originated by the Berkeley SETI Research Center at the University of California, Berkeley.

German astrophysicist and radio astronomer (1919–2003)

international scientific research project to search for extraterrestrial intelligence or extraterrestrial technology

Wikimedia list article

hypothetical autonomous artificially intelligent robotic interstellar probe seeking technological civilizations and communicate over short distances once it discovers one