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144 relations: Abiogenesis, Active SETI, Alan Dunn (cartoonist), Alan Guth, Aleksandr Leonidovich Zaitsev, Anders Sandberg, Anthropic principle, Apex predator, Archaeology, Arecibo message, Arecibo Observatory, Artificial intelligence, Asteroid mining, Astrobiology, Astrobiology (journal), Astronomical engineering, Astronomy & Geophysics, Atmosphere, Benjamin Zuckerman, Black-body radiation, Bracewell probe, Cambrian explosion, Carl Sagan, Cell (biology), Chronology of the universe, Circumstellar habitable zone, Civilization, Climate change, Cretaceous–Paleogene extinction event, Drake equation, Earth, Easter Island, Edward Robert Harrison, Edward Teller, Emil Konopinski, Enrico Fermi, Eukaryote, Evidence, Evolution of biological complexity, Existential risk from artificial general intelligence, Exoplanet, Extinction event, Extraterrestrial hypothesis, Extraterrestrial life, Faster-than-light, Fermi problem, Founder effect, Frank Drake, Frank J. Tipler, Freeman Dyson, ..., Frequency, Galactic habitable zone, Galaxy, Gamma-ray burst, Geoffrey A. Landis, Geologic time scale, Glacial period, Global warming, Great Filter, Habitat, Herbert York, Hertzsprung–Russell diagram, Homo sapiens, Human intelligence, Infrared, Interstellar travel, Iosif Shklovsky, John D. Barrow, Journal of the British Interplanetary Society, K. Eric Drexler, Kepler (spacecraft), KIC 8462852, Konstantin Tsiolkovsky, Light-year, Lithosphere, Little green men, Liu Cixin, Los Alamos National Laboratory, Magnetosphere, Main sequence, Mathematics, Mediocrity principle, Meiosis, Michael H. Hart, Milky Way, Mind uploading, Modal logic, Multiverse, Narrowband, Natural satellite, Nature (journal), Neutrino, Neutrino detector, Observable universe, Olbers' paradox, Order of magnitude, Overconfidence effect, Paradox, Percolation theory, Physicist, Planet, Planetary habitability, Plate tectonics, Postbiological evolution, Probability, Propositional calculus, PSR B1919+21, Pulsar, Radio telescope, Radio wave, Rare Earth hypothesis, Robert Freitas, Robert H. Gray, Science (journal), Search for extraterrestrial intelligence, SETI Institute, Sexual reproduction, Simulated reality, Solar analog, Solar System, Spaceflight, Spatial scale, Spectral line, Spectroscopy, Speed of light, Star formation, Star system, Stellar atmosphere, Sun, Synchronous frame, Technological singularity, Terrestrial planet, The Atlantic, The Dark Forest, The Independent, The New York Times, The Washington Post, Toby Ord, Unidentified flying object, Uniformity of motive, Vice Media, Wikisource, Wow! signal, Zoo hypothesis. Expand index (94 more) »
Abiogenesis
Abiogenesis, or informally the origin of life,Compare: Also occasionally called biopoiesis.
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Active SETI
Active SETI (Active Search for Extra-Terrestrial Intelligence) is the attempt to send messages to intelligent extraterrestrial life.
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Alan Dunn (cartoonist)
Alan Dunn (1900–1974) was a cartoonist known for his work in The New Yorker.
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Alan Guth
Alan Harvey Guth (born February 27, 1947) is an American theoretical physicist and cosmologist.
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Aleksandr Leonidovich Zaitsev
Aleksandr Leonidovich Zaitsev (Александр Леонидович Зайцев; born May 19, 1945) is a Russian and Soviet radio engineer and astronomer from Fryazino.
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Anders Sandberg
Anders Sandberg (born 11 July 1972) is a researcher, science debater, futurist, transhumanist and author.
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Anthropic principle
The anthropic principle is a philosophical consideration that observations of the universe must be compatible with the conscious and sapient life that observes it.
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Apex predator
An apex predator, also known as an alpha predator or top predator, is a predator at the top of a food chain, with no natural predators.
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Archaeology
Archaeology, or archeology, is the study of humanactivity through the recovery and analysis of material culture.
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Arecibo message
The Arecibo message is a 1974 interstellar radio message carrying basic information about humanity and Earth sent to globular star cluster M13 in the hope that extraterrestrial intelligence might receive and decipher it.
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Arecibo Observatory
The Arecibo Observatory is a radio telescope in the municipality of Arecibo, Puerto Rico.
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Artificial intelligence
Artificial intelligence (AI, also machine intelligence, MI) is intelligence demonstrated by machines, in contrast to the natural intelligence (NI) displayed by humans and other animals.
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Asteroid mining
Asteroid mining is the exploitation of raw materials from asteroids and other minor planets, including near-Earth objects.
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Astrobiology
Astrobiology is a branch of biology concerned with the origins, early evolution, distribution, and future of life in the universe.
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Astrobiology (journal)
Astrobiology is a peer-reviewed scientific journal covering research on the origin, evolution, distribution and future of life across the universe.
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Astronomical engineering
Engineering on an astronomical scale, or astronomical engineering, i.e., engineering involving operations with whole astronomical objects (planets, stars, etc.), is a known theme in science fiction, as well as a matter of recent scientific research and exploratory engineering.
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Astronomy & Geophysics
Astronomy & Geophysics (A&G) is a scientific journal and trade magazine published on behalf of the Royal Astronomical Society (RAS) by Oxford University Press.
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Atmosphere
An atmosphere is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body.
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Benjamin Zuckerman
Benjamin Michael Zuckerman (born August 16, 1943) is an astrophysicist and an emeritus professor in the Department of Physics & Astronomy at UCLA.
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Black-body radiation
Black-body radiation is the thermal electromagnetic radiation within or surrounding a body in thermodynamic equilibrium with its environment, or emitted by a black body (an opaque and non-reflective body).
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Bracewell probe
A Bracewell probe is a hypothetical concept for an autonomous interstellar space probe dispatched for the express purpose of communication with one or more alien civilizations.
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Cambrian explosion
The Cambrian explosion or Cambrian radiation was an event approximately in the Cambrian period when most major animal phyla appeared in the fossil record.
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Carl Sagan
Carl Edward Sagan (November 9, 1934 – December 20, 1996) was an American astronomer, cosmologist, astrophysicist, astrobiologist, author, science popularizer, and science communicator in astronomy and other natural sciences.
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Cell (biology)
The cell (from Latin cella, meaning "small room") is the basic structural, functional, and biological unit of all known living organisms.
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Chronology of the universe
The chronology of the universe describes the history and future of the universe according to Big Bang cosmology.
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Circumstellar habitable zone
In astronomy and astrobiology, the circumstellar habitable zone (CHZ), or simply the habitable zone, is the range of orbits around a star within which a planetary surface can support liquid water given sufficient atmospheric pressure.
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Civilization
A civilization or civilisation (see English spelling differences) is any complex society characterized by urban development, social stratification imposed by a cultural elite, symbolic systems of communication (for example, writing systems), and a perceived separation from and domination over the natural environment.
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Climate change
Climate change is a change in the statistical distribution of weather patterns when that change lasts for an extended period of time (i.e., decades to millions of years).
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Cretaceous–Paleogene extinction event
The Cretaceous–Paleogene (K–Pg) extinction event, also known as the Cretaceous–Tertiary (K–T) extinction, was a sudden mass extinction of some three-quarters of the plant and animal species on Earth, approximately 66 million years ago.
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Drake equation
The Drake equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy.
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Earth
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
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Easter Island
Easter Island (Rapa Nui, Isla de Pascua) is a Chilean island in the southeastern Pacific Ocean, at the southeasternmost point of the Polynesian Triangle in Oceania.
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Edward Robert Harrison
Edward R. "Ted" Harrison (8 January 1919 – 29 January 2007) was a British astronomer and cosmologist, noted for his work about the increase of fluctuations in the expanding universe, for his explanation of Olbers' Paradox, and for his books on cosmology for lay readers.
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Edward Teller
Edward Teller (Teller Ede; January 15, 1908 – September 9, 2003) was a Hungarian-American theoretical physicist who is known colloquially as "the father of the hydrogen bomb", although he claimed he did not care for the title.
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Emil Konopinski
Emil John (Jan) Konopinski (December 25, 1911 in Michigan City, Indiana – May 26, 1990 in Bloomington, Indiana) was an American nuclear scientist, New York Times of Polish origin.
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Enrico Fermi
Enrico Fermi (29 September 1901 – 28 November 1954) was an Italian-American physicist and the creator of the world's first nuclear reactor, the Chicago Pile-1.
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Eukaryote
Eukaryotes are organisms whose cells have a nucleus enclosed within membranes, unlike Prokaryotes (Bacteria and other Archaea).
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Evidence
Evidence, broadly construed, is anything presented in support of an assertion.
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Evolution of biological complexity
The evolution of biological complexity is one important outcome of the process of evolution.
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Existential risk from artificial general intelligence
Existential risk from artificial general intelligence is the hypothesis that substantial progress in artificial general intelligence (AI) could someday result in human extinction or some other unrecoverable global catastrophe.
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Exoplanet
An exoplanet or extrasolar planet is a planet outside our solar system.
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Extinction event
An extinction event (also known as a mass extinction or biotic crisis) is a widespread and rapid decrease in the biodiversity on Earth.
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Extraterrestrial hypothesis
The extraterrestrial hypothesis (ETH) proposes that some unidentified flying objects (UFOs) are best explained as being physical spacecraft occupied by extraterrestrial life or non-human aliens from other planets visiting Earth.
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Extraterrestrial life
Extraterrestrial life,Where "extraterrestrial" is derived from the Latin extra ("beyond", "not of") and terrestris ("of Earth", "belonging to Earth").
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Faster-than-light
Faster-than-light (also superluminal or FTL) communication and travel are the conjectural propagation of information or matter faster than the speed of light.
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Fermi problem
In physics or engineering education, a Fermi problem, Fermi quiz, Fermi question, Fermi estimate, or order estimation is an estimation problem designed to teach dimensional analysis or approximation, and such a problem is usually a back-of-the-envelope calculation.
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Founder effect
In population genetics, the founder effect is the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population.
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Frank Drake
Frank Donald Drake (born May 28, 1930) is an American astronomer and astrophysicist.
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Frank J. Tipler
Frank Jennings Tipler (born February 1, 1947) is an American mathematical physicist and cosmologist, holding a joint appointment in the Departments of Mathematics and Physics at Tulane University.
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Freeman Dyson
Freeman John Dyson (born 15 December 1923) is an English-born American theoretical physicist and mathematician.
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Frequency
Frequency is the number of occurrences of a repeating event per unit of time.
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Galactic habitable zone
In astrobiology and planetary astrophysics, the galactic habitable zone is the region of a galaxy in which life might most likely develop.
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Galaxy
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.
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Gamma-ray burst
In gamma-ray astronomy, gamma-ray bursts (GRBs) are extremely energetic explosions that have been observed in distant galaxies.
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Geoffrey A. Landis
Geoffrey Alan Landis (born May 28, 1955) is an American scientist, working for the National Aeronautics and Space Administration (NASA) on planetary exploration, interstellar propulsion, solar power and photovoltaics.
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Geologic time scale
The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time.
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Glacial period
A glacial period (alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances.
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Global warming
Global warming, also referred to as climate change, is the observed century-scale rise in the average temperature of the Earth's climate system and its related effects.
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Great Filter
The Great Filter, in the context of the Fermi paradox, is whatever prevents "dead matter" from giving rise, in time, to "expanding lasting life".
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Habitat
In ecology, a habitat is the type of natural environment in which a particular species of organism lives.
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Herbert York
Herbert Frank York (24 November 1921 – 19 May 2009) was a part-Mohawkhttp://www.edge.org/conversation/nsa-the-decision-problem.
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Hertzsprung–Russell diagram
The Hertzsprung–Russell diagram, abbreviated H–R diagram, HR diagram or HRD, is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.
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Homo sapiens
Homo sapiens is the systematic name used in taxonomy (also known as binomial nomenclature) for the only extant human species.
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Human intelligence
Human intelligence is the intellectual prowess of humans, which is marked by complex cognitive feats and high levels of motivation and self-awareness.
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Infrared
Infrared radiation (IR) is electromagnetic radiation (EMR) with longer wavelengths than those of visible light, and is therefore generally invisible to the human eye (although IR at wavelengths up to 1050 nm from specially pulsed lasers can be seen by humans under certain conditions). It is sometimes called infrared light.
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Interstellar travel
Interstellar travel is the term used for hypothetical crewed or uncrewed travel between stars or planetary systems.
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Iosif Shklovsky
Iosif Samuilovich Shklovsky (Ио́сиф Самуи́лович Шкло́вский; sometimes transliterated Josif, Josif, Shklovskii, Shklovskij) (July 1, 1916 – March 3, 1985) was a Soviet astronomer and astrophysicist.
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John D. Barrow
John David Barrow (born 29 November 1952) is an English cosmologist, theoretical physicist, and mathematician.
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Journal of the British Interplanetary Society
The Journal of the British Interplanetary Society (JBIS) is a monthly peer-reviewed scientific journal that was established in 1934.
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K. Eric Drexler
Kim Eric Drexler (born April 25, 1955) is an American engineer best known for popularizing the potential of molecular nanotechnology (MNT), from the 1970s and 1980s.
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Kepler (spacecraft)
Kepler is a space observatory launched by NASA to discover Earth-size planets orbiting other stars.
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KIC 8462852
KIC 8462852 (also Tabby's Star or Boyajian's Star) is an F-type main-sequence star located in the constellation Cygnus approximately from Earth.
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Konstantin Tsiolkovsky
Konstantin Eduardovich Tsiolkovsky (a; Konstanty Ciołkowski; 19 September 1935) was a Russian and Soviet rocket scientist and pioneer of the astronautic theory of ethnic Polish descent.
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Light-year
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
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Lithosphere
A lithosphere (λίθος for "rocky", and σφαίρα for "sphere") is the rigid, outermost shell of a terrestrial-type planet, or natural satellite, that is defined by its rigid mechanical properties.
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Little green men
Little green men is the stereotypical portrayal of extraterrestrials as little humanoid-like creatures with green skin and sometimes with antennae on their heads.
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Liu Cixin
Liu Cixin (born 23 June 1963) is a Chinese science fiction writer.
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Los Alamos National Laboratory
Los Alamos National Laboratory (Los Alamos or LANL for short) is a United States Department of Energy national laboratory initially organized during World War II for the design of nuclear weapons as part of the Manhattan Project.
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Magnetosphere
A magnetosphere is the region of space surrounding an astronomical object in which charged particles are manipulated or affected by that object's magnetic field.
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Main sequence
In astronomy, the main sequence is a continuous and distinctive band of stars that appear on plots of stellar color versus brightness.
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Mathematics
Mathematics (from Greek μάθημα máthēma, "knowledge, study, learning") is the study of such topics as quantity, structure, space, and change.
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Mediocrity principle
The mediocrity principle is the philosophical notion that "if an item is drawn at random from one of several sets or categories, it's likelier to come from the most numerous category than from any one of the less numerous categories".
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Meiosis
Meiosis (from Greek μείωσις, meiosis, which means lessening) is a specialized type of cell division that reduces the chromosome number by half, creating four haploid cells, each genetically distinct from the parent cell that gave rise to them.
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Michael H. Hart
Michael H. Hart (born April 27, 1932) is an American astrophysicist and author, most notably of The 100: A Ranking of the Most Influential Persons in History.
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Milky Way
The Milky Way is the galaxy that contains our Solar System.
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Mind uploading
Whole brain emulation (WBE), mind upload or brain upload (sometimes called "mind copying" or "mind transfer") is the hypothetical futuristic process of scanning the mental state (including long-term memory and "self") of a particular brain substrate and copying it to a computer.
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Modal logic
Modal logic is a type of formal logic primarily developed in the 1960s that extends classical propositional and predicate logic to include operators expressing modality.
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Multiverse
The multiverse (or meta-universe) is a hypothetical group of multiple separate universes including the universe in which humans live.
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Narrowband
In radio, narrowband describes a channel in which the bandwidth of the message does not significantly exceed the channel's coherence bandwidth.
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Natural satellite
A natural satellite or moon is, in the most common usage, an astronomical body that orbits a planet or minor planet (or sometimes another small Solar System body).
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Nature (journal)
Nature is a British multidisciplinary scientific journal, first published on 4 November 1869.
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Neutrino
A neutrino (denoted by the Greek letter ν) is a fermion (an elementary particle with half-integer spin) that interacts only via the weak subatomic force and gravity.
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Neutrino detector
A neutrino detector is a physics apparatus which is designed to study neutrinos.
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Observable universe
The observable universe is a spherical region of the Universe comprising all matter that can be observed from Earth at the present time, because electromagnetic radiation from these objects has had time to reach Earth since the beginning of the cosmological expansion.
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Olbers' paradox
In astrophysics and physical cosmology, Olbers' paradox, named after the German astronomer Heinrich Wilhelm Olbers (1758–1840), also known as the "dark night sky paradox", is the argument that the darkness of the night sky conflicts with the assumption of an infinite and eternal static universe.
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Order of magnitude
An order of magnitude is an approximate measure of the number of digits that a number has in the commonly-used base-ten number system.
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Overconfidence effect
The overconfidence effect is a well-established bias in which a person's subjective confidence in his or her judgements is reliably greater than the objective accuracy of those judgements, especially when confidence is relatively high.
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Paradox
A paradox is a statement that, despite apparently sound reasoning from true premises, leads to an apparently self-contradictory or logically unacceptable conclusion.
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Percolation theory
In statistical physics and mathematics, percolation theory describes the behaviour of connected clusters in a random graph.
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Physicist
A physicist is a scientist who has specialized knowledge in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe.
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Planet
A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
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Planetary habitability
Planetary habitability is the measure of a planet's or a natural satellite's potential to have habitable environments hospitable to life, or its ability to generate life endogenously.
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Plate tectonics
Plate tectonics (from the Late Latin tectonicus, from the τεκτονικός "pertaining to building") is a scientific theory describing the large-scale motion of seven large plates and the movements of a larger number of smaller plates of the Earth's lithosphere, since tectonic processes began on Earth between 3 and 3.5 billion years ago.
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Postbiological evolution
Postbiological evolution is a form of evolution which has transitioned from a biological paradigm, driven by the propagation of genes, to a nonbiological (e.g., cultural or technological) paradigm, presumably driven by some alternative replicator (e.g., memes or temes), and potentially resulting in the extinction, obsolescence, or trophic reorganization of the former.
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Probability
Probability is the measure of the likelihood that an event will occur.
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Propositional calculus
Propositional calculus is a branch of logic.
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PSR B1919+21
PSR B1919+21 is a pulsar with a period of 1.3373 seconds and a pulse width of 0.04 seconds.
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Pulsar
A pulsar (from pulse and -ar as in quasar) is a highly magnetized rotating neutron star or white dwarf that emits a beam of electromagnetic radiation.
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Radio telescope
A radio telescope is a specialized antenna and radio receiver used to receive radio waves from astronomical radio sources in the sky in radio astronomy.
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Radio wave
Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light.
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Rare Earth hypothesis
In planetary astronomy and astrobiology, the Rare Earth Hypothesis argues that the origin of life and the evolution of biological complexity such as sexually reproducing, multicellular organisms on Earth (and, subsequently, human intelligence) required an improbable combination of astrophysical and geological events and circumstances.
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Robert Freitas
Robert A. Freitas Jr. (born 1952) is a nanotechnology scientist.
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Robert H. Gray
Robert H. Gray is an American data analyst, author, and astronomer, and author of The Elusive Wow: Searching for Extraterrestrial Intelligence.
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Science (journal)
Science, also widely referred to as Science Magazine, is the peer-reviewed academic journal of the American Association for the Advancement of Science (AAAS) and one of the world's top academic journals.
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Search for extraterrestrial intelligence
The search for extraterrestrial intelligence (SETI) is a collective term for scientific searches for intelligent extraterrestrial life, for example, monitoring electromagnetic radiation for signs of transmissions from civilizations on other planets.
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SETI Institute
The SETI Institute is a not-for-profit research organization whose mission is to explore, understand, and explain the origin and nature of life in the universe, and to apply the knowledge gained to inspire and guide present and future generations.
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Sexual reproduction
Sexual reproduction is a form of reproduction where two morphologically distinct types of specialized reproductive cells called gametes fuse together, involving a female's large ovum (or egg) and a male's smaller sperm.
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Simulated reality
Simulated reality is the hypothesis that reality could be simulated—for example by quantum computer simulation—to a degree indistinguishable from "true" reality.
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Solar analog
Solar-type star, solar analogs (also analogues), and solar twins are stars that are particularly similar to the Sun.
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Solar System
The Solar SystemCapitalization of the name varies.
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Spaceflight
Spaceflight (also written space flight) is ballistic flight into or through outer space.
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Spatial scale
In sciences such as physics, geography, astronomy, meteorology and statistics, the term scale or spatial scale is used for describing or classifying with large approximation the extent or size of a length, distance or area studied or described.
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Spectral line
A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies.
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Spectroscopy
Spectroscopy is the study of the interaction between matter and electromagnetic radiation.
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Speed of light
The speed of light in vacuum, commonly denoted, is a universal physical constant important in many areas of physics.
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Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as "stellar nurseries" or "star-forming regions", collapse and form stars.
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Star system
A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction.
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Stellar atmosphere
The stellar atmosphere is the outer region of the volume of a star, lying above the stellar core, radiation zone and convection zone.
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Sun
The Sun is the star at the center of the Solar System.
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Synchronous frame
In the special theory of relativity, choice of coordinates is limited by the requirement for a special kind of spacetime metric: the Minkowski metric.
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Technological singularity
The technological singularity (also, simply, the singularity) is the hypothesis that the invention of artificial superintelligence (ASI) will abruptly trigger runaway technological growth, resulting in unfathomable changes to human civilization.
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Terrestrial planet
A terrestrial planet, telluric planet, or rocky planet is a planet that is composed primarily of silicate rocks or metals.
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The Atlantic
The Atlantic is an American magazine and multi-platform publisher, founded in 1857 as The Atlantic Monthly in Boston, Massachusetts.
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The Dark Forest
The Dark Forest is a 2008 science fiction novel by the Chinese writer Liu Cixin.
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The Independent
The Independent is a British online newspaper.
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The New York Times
The New York Times (sometimes abbreviated as The NYT or The Times) is an American newspaper based in New York City with worldwide influence and readership.
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The Washington Post
The Washington Post is a major American daily newspaper founded on December 6, 1877.
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Toby Ord
Toby David Godfrey Ord (born 18 July 1979) is an Australian philosopher.
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Unidentified flying object
An unidentified flying object or "UFO" is an object observed in the sky that is not readily identified.
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Uniformity of motive
In astrobiology, the Uniformity of Motive theory suggests that any civilization in the universe would go through similar technological steps in their development.
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Vice Media
Vice Media LLC is a North American digital media and broadcasting company.
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Wikisource
Wikisource is an online digital library of free content textual sources on a wiki, operated by the Wikimedia Foundation.
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Wow! signal
The Wow! signal was a strong narrowband radio signal received 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.
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Zoo hypothesis
The zoo hypothesis speculates as to the assumed behavior and existence of technically advanced extraterrestrial life and the reasons they refrain from contacting Earth and is one of many theoretical explanations for the Fermi paradox.
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Redirects here:
Astrosociological paradox, Dyson dilemma, Fermi Paradox, Fermi Principle, Fermi principle, Fermi's Paradox, Fermi's paradox, Fermi-Hart Paradox, Fermi`s paradox, Graveyard civilization, Great Silence (astronomy), SETI paradox, Silencium universi, Silentium universi, Space travel argument, Sustainability solution, The Fermi Paradox, Transcension Hypothesis, Where are they?, Where is everybody, Why we haven't seen aliens.
References
[1] https://en.wikipedia.org/wiki/Fermi_paradox
