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Single-access key. In phylogenetics, a single-access key (also called dichotomous key, sequential key, analytical key, [1] or pathway key) is an identification key where the sequence and structure of identification steps is fixed by the author of the key. At each point in the decision process, multiple alternatives are offered, each leading to ...
Identification key. In biology, an identification key, taxonomic key, or frequently just key, is a printed or computer-aided device that aids in the identification of biological organisms. Historically, the most common type of identification key is the dichotomous key, a type of single-access key which offers a fixed sequence of identification ...
The communication with extraterrestrial intelligence (CETI) is a branch of the search for extraterrestrial intelligence (SETI) that focuses on composing and deciphering interstellar messages that theoretically could be understood by another technological civilization. [ 1 ] The best-known CETI experiment of its kind was the 1974 Arecibo message ...
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Greys have been the predominant extraterrestrial beings of alleged alien contact since the 1960s. [5] Hopkinsville goblin [6][7][8] Small, greenish-silver humanoids. [9] Little green men [10] Diminutive green humanoids. Even though a few abductions have referred to green skin, no report has ever involved anything that would fit the classic ...
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. [ 1 ][ 2 ][ 3 ] Scientific investigation began shortly after the advent of radio in the early ...
Dark forest hypothesis. The dark forest hypothesis is the conjecture that many alien civilizations exist throughout the universe, but they are both silent and hostile, maintaining their undetectability for fear of being destroyed by another hostile and undetected civilization. [1] It is one of many possible explanations of the Fermi paradox ...
Cryptids. Other name (s) Aliens, space aliens. An extraterrestrial or alien is a lifeform that did not originate on Earth. The word extraterrestrial means "outside Earth". Extraterrestrials are a common theme in modern science-fiction, and also appeared in much earlier works such as the second-century parody True History [1] by Lucian of Samosata.