All articles starting with X
1,563 articles
Xenoblade Chronicles X
Xenoblade Chronicles X (ゼノブレイドクロス) is Monolith Soft's 2015 Wii U open-world sci-fi RPG set on planet Mira, featuring Skell mechs, 32-player online squads, and a March 2025 Switch Definitive Edition with a Switch 2 Edition in 2026.
Xenobot
Xenobots are living robots built from African clawed frog (Xenopus laevis) embryonic cells, AI-designed and first reported January 2020 by Kriegman, Blackiston, Levin, and Bongard; later versions swarm via cilia and show kinematic self-replication (2021).
Xenocide
Xenocide (1991) is Orson Scott Card's third Ender Saga novel, set on Lusitania and Path, where Starways Congress orders a second xenocide over the descolada virus; published by Tor, Hugo-nominated, split from Children of the Mind.
Xenodiagnosis
Xenodiagnosis is a diagnostic method in which laboratory-reared triatomine bugs feed on a patient's blood and are later examined for Trypanosoma cruzi, mainly to confirm chronic Chagas disease.
Xenofiction
Xenofiction presents stories from nonhuman perspectives, exploring how animals or imagined extraterrestrials perceive, communicate, and organize their lives. Its central challenge is making unfamiliar minds intelligible without erasing their differences.
Xenogears
Xenogears (ゼノギアス) is a 1998 Square PlayStation JRPG directed and written by Tetsuya Takahashi with Soraya Saga, music by Yasunori Mitsuda. A two-disc sci-fi epic about Gears, Gnosticism, and psychology, known for its narrated Disc 2 and Metascore of 84.
Xenoma
Xenoma: a hypertrophic host cell transformed by an intracellular parasite, mainly microsporidia such as Glugea, Loma, and Spraguea, forming a xenoparasitic complex most often in fish, up to 13 mm or several centimeters.
Xenomai
Xenomai is a real-time development framework for GNU/Linux, created in the early 2000s by Philippe Gerum to migrate industrial applications from proprietary RTOSes to Linux.
Xenomorph
The Xenomorph (Xenomorph XX121, Internecivus raptus) is the fictional parasitoid alien species of the Alien franchise, debuting in Alien (1979). Designed by H.R. Giger from his painting Necronom IV, it reproduces via egg, facehugger, chestburster, and adult stages, including the Queen introduced in Aliens (1986).
Xenon
Xenon (Xe) is a colorless, odorless noble gas, atomic number 54, discovered in 1898 and best known for its blue glow and use in ion engines.
Xenon arc lamp
A xenon arc lamp is a gas discharge lamp whose electric arc through high-pressure xenon yields daylight-like white light, standard for cinema projection from 1954 into the 2010s.
Xenon compounds
Xenon compounds, also called compounds of xenon, are chemical compounds of the noble gas xenon, first made by Neil Bartlett in 1962, with more than 200 now known.
Xenon dioxide
Xenon dioxide (XeO₂) is a yellow solid xenon oxide first synthesized in 2011, notable for its polymeric structure and possible role in xenon's disappearance from Earth's atmosphere.
Xenon oxides
Xenon oxides are compounds of the noble gas xenon and oxygen, including XeO₃ and XeO₄; at ambient pressure they are unstable, and some are explosive.
Xenon-129
Xenon-129 (^129Xe) is a stable isotope of the noble gas xenon with about 26.4 percent natural abundance, whose hyperpolarized spins enable lung MRI, and which the FDA approved as the contrast agent XENOVIEW in 2022.
Xenon-133
Xenon-133 is a radioactive isotope of the noble gas xenon, with a half-life of 5.245 days, inhaled medically to image lung ventilation and assess cerebral blood flow.
Xenon-135
Xenon-135 is a radioactive xenon isotope produced in nuclear fission whose enormous neutron absorption cross section makes it the most consequential neutron poison in reactor operation.
Xenon–iron compounds
Xenon–iron compounds are chemical combinations of the noble gas xenon and iron that form only at high pressures, notably XeFe₃, first synthesized at Earth-core conditions in 2018.
Xenon–krypton separation
Xenon–krypton separation is the industrial task of splitting mixtures of the chemically inert noble gases xenon and krypton, achieved by energy-intensive cryogenic distillation, membranes, or porous metal–organic framework adsorbents.
XENON1T
XENON1T was a dual-phase xenon dark matter detector at Italy's Gran Sasso laboratory, the first ton-scale detector of its kind, which reported an unexplained excess in 2020.
XENONnT
XENONnT is a dark matter direct detection experiment at the Gran Sasso laboratory in Italy, using a 5.9-tonne liquid xenon chamber to search for WIMPs and solar neutrinos.
Xenophanes (lunar crater)
Xenophanes, lunar crater (walled plain) 117.57 km across at 57.49°N, 82.01°W, named for Xenophanes of Colophon; satellite craters include Xenophanes L, 22.41 km, IAU-approved 2006.
Xenophobia
Xenophobia: rejection, exclusion, or vilification of people perceived as foreigners; no binding international definition; coined in English 1880; addressed at Durban 2001; linked to racism, health harm, and hate crime.
Xenophobia in South Africa
Xenophobia in South Africa: hostility and recurrent violence against foreign nationals, with major episodes in 2008 (62 dead), 2015, 2019 and the 2026 March and March crisis.
Xenophon (Ξενοφῶν)
Xenophon (Ξενοφῶν), Athenian historian, soldier, and Socratic writer, son of Gryllus of Erchia, led the Ten Thousand after Cunaxa (401 BC) and wrote the Anabasis, Hellenica, Cyropaedia, and Memorabilia.
Xenopus
Xenopus, a genus of African clawed frogs; X. laevis and X. tropicalis are premier vertebrate model organisms for embryology, oocyte expression, cell-cycle extracts, toxicology (FETAX), and human disease gene testing.
Xenorhabdus
Xenorhabdus (type species X. nematophila) is a genus of Gram-negative entomopathogenic bacteria, obligate symbionts of Steinernema nematodes, used with them for insect biocontrol; 26 species known by 2020.
Xenos vesparum
Xenos vesparum (Rossius, 1793), a strepsipteran twisted-wing parasite, is an obligate endoparasitoid of the paper wasp Polistes dominula; it castrates female hosts, alters their caste behavior, and mates via an extruded cephalothorax.
Xenosaga
Xenosaga, a Monolith Soft PlayStation 2 RPG trilogy (2002–2006) published by Namco/Bandai Namco, spiritual successor to Xenogears; planned six games cut to three, Episode I sold over one million copies, no modern rerelease.
Xenotime
Xenotime is a rare-earth phosphate mineral, the yttrium orthophosphate end member of the xenotime group, one of the three principal rare-earth ores and an important source of heavy rare earths.