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The Drake equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way Galaxy.
Extraterrestrial life, alien life, or colloquially simply aliens is life which does not originate from Earth. No extraterrestrial life has yet been conclusively detected. Such life might range from simple forms such as prokaryotes to intelligent beings, possibly bringing forth civilizations that might be far more advanced than humanity. The Drake equation speculates about the existence of sapient life elsewhere in the universe. The science of extraterrestrial life is known as astrobiology.
An exoplanet or extrasolar planet is a planet outside the Solar System. The first possible evidence of an exoplanet was noted in 1917 but was not then recognized as such. The first confirmation of the detection occurred in 1992. A different planet, first detected in 1988, was confirmed in 2003. As of 1 April 2024, there are 5,653 confirmed exoplanets in 4,161 planetary systems, with 896 systems having more than one planet. The James Webb Space Telescope (JWST) is expected to discover more exoplanets, and to give more insight into their traits, such as their composition, environmental conditions, and potential for life.
The Romulans are an extraterrestrial race in the American science fiction franchise Star Trek. Their adopted home world is Romulus and within the same star system, they have settled a sister planet Remus, their original home world Vulcan was renamed Ni'Var later on in canon. They first appeared in the series Star Trek (1966–1969). They have appeared in most subsequent Star Trek releases, including The Animated Series, The Next Generation, Deep Space Nine, Voyager, Enterprise, Discovery, Picard, Strange New Worlds, and Lower Decks. They appear in the Star Trek feature films Star Trek V: The Final Frontier (1989), Star Trek VI: The Undiscovered Country (1991), Star Trek: Nemesis (2002) and Star Trek (2009). They also appear in various other spin-off media, including books, comics, toys and games.
Starfleet is a fictional organization in the Star Trek media franchise. Within this fictional universe, Starfleet is a uniformed space force maintained by the United Federation of Planets as the principal means for conducting deep space exploration, research, defense, peacekeeping, and diplomacy. While most of Starfleet's members are human and it has been headquartered on Earth, hundreds of other species are also represented. Most of the franchise's protagonists are Starfleet commissioned officers.
Vulcans, sometimes referred to as Vulcanians, are a fictional extraterrestrial humanoid species in the Star Trek universe and media franchise. In the various Star Trek television series and films, they are noted for their attempt to live by logic and reason with as little interference from emotion as possible. Known for their pronounced eyebrows and pointed ears, they originate from the fictional planet Vulcan. In the Star Trek universe, they were the first extraterrestrial species to make contact with humans.
In the fictional universe of Star Trek, the United Federation of Planets (UFP) is the interstellar government with which, as part of its space force Starfleet, most of the characters and starships of the franchise are affiliated. Commonly referred to as "the Federation", it was introduced in the original Star Trek television series. The survival, success, and growth of the Federation and its principles of freedom have become some of the Star Trek franchise's central themes.
Sarek is a fictional character in the Star Trek media franchise. He is a Vulcan astrophysicist, the Vulcan ambassador to the United Federation of Planets, and father of Spock. The character was originally played by Mark Lenard in the episode "Journey to Babel" in 1967. Lenard later voiced Sarek in the animated series, and appeared in Star Trek films and the series Star Trek: The Next Generation.
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 required an improbable combination of astrophysical and geological events and circumstances.
In astronomy and astrobiology, the habitable zone (HZ), or more precisely the circumstellar habitable zone (CHZ), is the range of orbits around a star within which a planetary surface can support liquid water given sufficient atmospheric pressure. The bounds of the HZ are based on Earth's position in the Solar System and the amount of radiant energy it receives from the Sun. Due to the importance of liquid water to Earth's biosphere, the nature of the HZ and the objects within it may be instrumental in determining the scope and distribution of planets capable of supporting Earth-like extraterrestrial life and intelligence.
"Strange New World" is the fourth episode of the television series Star Trek: Enterprise and was written by Mike Sussman Phyllis Strong based on a story from producers Brannon Braga and Rick Berman. David Livingston served as director for the episode.
Planetary habitability is the measure of a planet's or a natural satellite's potential to develop and maintain environments hospitable to life. Life may be generated directly on a planet or satellite endogenously or be transferred to it from another body, through a hypothetical process known as panspermia. Environments do not need to contain life to be considered habitable nor are accepted habitable zones (HZ) the only areas in which life might arise.
Gliese 581 is a red dwarf star of spectral type M3V at the center of the Gliese 581 planetary system, about 20.5 light years away from Earth in the Libra constellation. Its estimated mass is about a third of that of the Sun, and it is the 101st closest known star system to the Sun. Gliese 581 is one of the oldest, least active M dwarfs known. Its low stellar activity improves the likelihood of its planets retaining significant atmospheres, and lessens the sterilizing impact of stellar flares.
The planetary systems of stars other than the Sun and the Solar System are a staple element in many works of the science fiction genre.
An Earth analog, also called an Earth analogue, Earth twin, or second Earth, is a planet or moon with environmental conditions similar to those found on Earth. The term Earth-like planet is also used, but this term may refer to any terrestrial planet.
The following outline is provided as an overview of and topical guide to Star Trek:
The theorized habitability of red dwarf systems is determined by a large number of factors. Modern evidence indicates that planets in red dwarf systems are unlikely to be habitable, due to their low stellar flux, high probability of tidal locking and thus likely lack of magnetospheres and atmospheres, small circumstellar habitable zones and the high stellar variation experienced by planets of red dwarf stars. However, the sheer numbers and longevity of red dwarfs could provide ample opportunity to realize any small possibility of habitability.
Kepler-186f is an Earth-sized exoplanet orbiting within the habitable zone of the red dwarf star Kepler-186, the outermost of five such planets discovered around the star by NASA's Kepler spacecraft. It is located about 580 light-years from Earth in the constellation of Cygnus.
Kepler-442b is a confirmed near-Earth-sized exoplanet, likely rocky, orbiting within the habitable zone of the K-type main-sequence star Kepler-442, about 1,206 light-years (370 pc) from Earth in the constellation of Lyra.
References
- 1 2 Fazekas, Andrew (July 22, 2016). "How to See 'Star Trek' Worlds in the Night Sky". National Geographic . National Geographic Society. Archived from the original on July 25, 2021. Retrieved July 25, 2021.
- 1 2 Vogel, Gretchen (1999). "Expanding the Habitable Zone". Science. 286 (5437): 70–71. doi:10.1126/science.286.5437.70. PMID 10532892. S2CID 34476735 . Retrieved 26 July 2021.
- ↑ Erdman, Terry J.; Block, Paula M. (23 September 2008). Star Trek 101: A Practical Guide to Who, What, Where, and Why. Gallery Books. p. 21. ISBN 9780743497237.
