All articles starting with O
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Orion Nebula
The Orion Nebula, also known as Messier 42, is a diffuse nebula south of Orion's Belt where new stars form, the nearest region of massive star formation to Earth.
Orion Nebula Cluster
The Orion Nebula Cluster (ONC) is a young star cluster in the Orion A molecular cloud about 400 parsecs from the Sun, containing roughly 2000 stars within 2 parsecs.
Orion Pictures
Orion Pictures, also known as Orion Pictures Corporation, is an American film studio founded in 1978 that won four Best Picture Oscars before filing for bankruptcy in 1991.
Orion's Belt
Orion's Belt is an asterism of three blue supergiant stars, Alnitak, Alnilam, and Mintaka, arranged in an almost straight line at the center of the constellation Orion.
Orionids
The Orionids are an annual meteor shower produced when Earth crosses debris shed by Halley's Comet, active each October with a peak around October 21–22 and roughly 10 to 20 meteors per hour.
OrionStar
OrionStar (猎户星空) is a Chinese artificial intelligence and service robotics company founded in September 2016 by Fu Sheng under Cheetah Mobile, focused on voice-interaction robots for restaurants, hotels, and retail.
Oriori
Oriori, also called popo, are Māori lullabies and creation chants sung to a child from before birth, composed to transmit whakapapa, tribal history, and family aspirations.
Orisha
Orisha (Òrìṣà) are divine forces of Yoruba religion from Nigeria, Benin, and Togo, intermediaries between Olodumare and humans, carried by the slave trade into diaspora religions: Candomblé, Santería/Lucumí, and Trinidad Orisha.
Orishas (band)
Orishas, Cuban hip-hop group formed in Paris (1998/1999) by ex-Amenaza members Yotuel Romero, Ruzzo, Roldán González, and Flaco-Pro; debut A lo Cubano fused son, rumba, and rap, going platinum in Europe.
Orissa Famine of 1866
The Orissa Famine of 1866, known in Odia as the Na Anka famine, killed about one million people in coastal Orissa after the rice crop failed.
Orissus
Orissus, in Spanish Orissón and also rendered Orison, was a chieftain of the pre-Roman Oretani of southeastern Iberia, defeated at the Battle of Helicen in 228 BC.
Oritavancin
Oritavancin (Orbactiv), a long-acting lipoglycopeptide antibiotic with ~393-hour half-life, is approved as a single 1200 mg IV dose for Gram-positive ABSSSI and studied off-label for osteomyelitis, bacteraemia, and endocarditis.
Oritinib mesylate (SH-1028)
Oritinib mesylate (SH-1028, rilertinib, 圣瑞沙) is Nanjing Sanhome's irreversible third-generation EGFR TKI for NSCLC; NMPA approved it in 2024 for T790M-positive second-line and first-line EGFR-mutated disease.
Oritsé Williams
Oritsé Williams is a British singer-songwriter, founder of the boy band JLS, X Factor 2008 runner-up with five UK number one singles, now an independent Afro-Island solo artist and young carers advocate.
Orix
Orix (オリックス株式会社) is a Japanese diversified financial services group founded in Osaka in 1964 as Orient Leasing, now operating ten segments including leasing, banking, real estate, insurance, and aircraft leasing.
Orix Buffaloes (オリックス・バファローズ)
Orix Buffaloes (オリックス・バファローズ), NPB Pacific League team at Kyocera Dome Osaka; formed 2005 from Orix Blue Wave–Kintetsu Buffaloes merger; 15 PL pennants, 5 Japan Series titles including 2022.
Oriyo Timbo
Oriyo Timbo is a small Harappan settlement mound near Chiroda village in Gujarat, India, excavated in 1981/82 and interpreted as a short-lived pastoral settlement of the Rangpur III period.
Oriza/Oruba/Oresa
Oriza/Oruba/Oresa, an ancient place in the Syrian steppe identified with the oasis of Tayibe north of Palmyra; attested in Ptolemy, the Tabula Peutingeriana, and the Notitia Dignitatum as a base of Legio IV Scythica on the Strata Diocletiana.
Orizont
Orizont is a Romanian literary and cultural magazine published in Timișoara by the Writers' Union of Romania, appearing without interruption since 1964 and known as an anchor of Banat's literary life.
Örjan Gustafsson
Örjan Gustafsson, born 1968, is a Swedish biogeochemist and professor at Stockholm University known for the 2010 report of extensive methane venting from the East Siberian Arctic Shelf.
Orjan Nilsen
Ørjan Nilsen, born 1982, is a Norwegian trance DJ and producer from Kirkenes who broke through on Armada Music and is among the most-played artists on A State of Trance.
Orji Uzor Kalu
Orji Uzor Kalu is a Nigerian businessman and politician who founded SLOK Holding, governed Abia State from 1999 to 2007, and has been a senator since 2019.
Orkhon
Orkhon (Орхон) is Mongolia's longest river, 1,124 km, rising in the Khangai Mountains and joining the Selenga, which feeds Lake Baikal. Its valley holds Kharakhorum, Khar Balgas, and the UNESCO Orkhon Valley Cultural Landscape.
Orkhon inscriptions
The Orkhon inscriptions (Turkish: Orhun Yazıtları) are 8th-century Old Turkic commemorative stelae of the Second Turkic Qaganate in central Mongolia, deciphered by Vilhelm Thomsen in 1893.
Orkhon Valley Cultural Landscape
The Orkhon Valley Cultural Landscape (Орхоны хөндийн соёлын дурсгалт газар) is a UNESCO World Heritage Site in central Mongolia, inscribed in 2004 along the Orkhon River some 360 km southwest of Ulaanbaatar.
Orkhonbayar Bayarsaikhan (Баярсайханы Орхонбаяр)
Orkhonbayar Bayarsaikhan (Баярсайханы Орхонбаяр, born 1998 in Selenge province) is a Mongolian Bökh wrestler who won all ten rounds at the 2026 State Naadam to become Grand Champion.
Orkidea
Orkidea, born Antti Tapio Hakanen in Helsinki in 1977, is a Finnish trance DJ and producer best known for the 1998 track "Unity" and seven #1 DJ votes in Finland.
Orkney
Orkney, a Scottish archipelago of 68+ islands (990 km², 16 inhabited) north of mainland Scotland, with capital Kirkwall, Norse heritage, the Heart of Neolithic Orkney World Heritage Site, and the EMEC marine energy test centre.
Orkut
Orkut was a social networking website run by Google from 2004 until 2014, named after its creator Orkut Büyükkökten and dominant in Brazil and India.
Orla (dog)
Orla is the black working cocker spaniel of Prince William and Princess Kate, given by James Middleton in 2020; her name means "golden princess", and her 2025 litter produced their puppy Otto.