fschieber/wit-captions huggingface dataset:
Prototipo Helios volando momentos después de su despeje, comenzando su primer vuelo de prueba con energía solar desde las instalaciones de la Marina de Estados Unidos en Kauai, Hawái, julio 14, 2001
Collection: NASA Image eXchange Collection Title: The Helios Prototype flying wing is shown moments after takeoff, beginning its first test flight on Description: The solar-electric Helios Prototype flying wing is shown moments after takeoff, beginning its first test flight on solar power from the U.S. Navy's Pacific Missile Range Facility on Kauai, Hawaii, July 14, 2001. The 18-hour flight was a functional checkout of the aircraft's systems and performance in preparation for an attempt to reach sustained flight at 100,000 feet altitude later this summer. Date: 07.14.2001 Credit: NASA Dryden Flight Research Center (NASA-DFRC) [ www.dfrc.nasa.gov/gallery/ ] ID: ED01-0209-1 UID: SPD-NIX-ED01-0209-1 Original url: nix.ksc.nasa.gov/info?id=ED01-0209-1&orgid=7 SOURCE: nasaimages.org/luna/servlet/detail/nasaNAS~2~2~5084~106706 Visit www.nasaimages.org for the most comprehensive compilation of NASA stills, film and video, created in partnership with Internet Archive.
Μαρία Μανταλένα της Αυστρίας, σύζυγος του Μεγάλου Δούκα Κόζιμο Β΄ των Μεδίκων και αδελφή του Αυτοκράτορα Φερδινάνδου, με τον γιο της, μελλοντικό Μέγα Δούκα της Τοσκάνης Φερδινάνδο Γ΄. Λάδι σε καμβά.
Maria Maddalena of Austria (Wife of Duke Cosimo II de' Medici) with her Son, the Future Ferdinand II
संयुक्त राज्य अमेरिका के पूर्व अटार्नी जनरल रैमसे क्लार्क ने नवंबर 2007 में नंदीग्राम का दौरा किया और इस क्षेत्र में सीपीआई (एम) के अत्याचारों से त्रस्त गरीब किसानों के प्रति आत्मीयता जताई.[11],[12]
বাংলা: Description: Ramsey Clark, the former Attorney General of the United States visited Nandigram in November 2007 and expressed his solidarity to the poor peasants of the area who were tortured by the CPI(M). Source: Self-uploaded Date: November 29, 2007 Author: Sekharlk সূত্র - http://en.wikipedia.org/wiki/File:Ramsey_Clark_in_Nandigram.jpg
Pierre-Antoine Demachy: Ansicht des Pantheon, 1792. Auf der Kuppel der ursprünglich der hl. Genoveva, der Schutzpatronin von Paris, geweihten Kirche wurde anstelle des Kreuzes ein Genius angebracht.
Drawing of Panthéon by Pierre-Antoine de Machy
Thomas McIntyre Cooley, jurist, 25th Justice and Chief Justice of the Michigan Supreme Court, a Dean of the University of Michigan Law School, and honored namesake of the Thomas M. Cooley Law School
English: Portrait of Thomas Cooley by Lewis T. Ives. Thomas Cooley, Michigan Supreme Court, Chief Justice: 1868, 1869, 1870, 1876, 1877, 1878, 1884, 1885, served from 1864 through 1885. Michigan Supreme Court Historical Society
House seats by party holding plurality in state    80+% to 100% Democratic   80+% to 100% Republican    60+% to 80% Democratic   60+% to 80% Republican    Up to 60% Democratic   Up to 60% Republican
Summary of party control of U.S. house seats in the 58th United States Congress following election. Stripes indicate a tie between two or more parties. Legend:    80.1-100% Democratic seat majority    60.1-80% Democratic seat majority    60% or less Democratic seat plurality    60% or less Republican seat plurality    60.1-80% Republican seat majority    80.1-100% Republican seat majority
Posisi Danau Albert dilihat dari Satelit NASA MODIS.

(foto diambil pada tahun 2002)

Titik-titik abu-abu adalah garis perbatasan antara Republik Demokratik Kongo (kiri) dan Republik Uganda (kanan).
The moonlight Battle off Cape St Vincent, 16 January 1780 by Francis Holman, painted 1780 shows the Santo Domingo exploding. MacBride had been heavily engaged with her just prior to her destruction.
The moonlight Battle of Cape St Vincent, 16 January 1780 by Francis Holman, painted 1780. The moonlight Battle off Cape St Vincent, 16 January 1780 by Francis Holman, painted 1780 shows Santo Domingo exploding, with Rodney's flagship Sandwich in the foreground.
Barracks at Cape Fullerton, Nunavut, Canada, 1904. Photo by J. D. Moodie. The original notes with this photograph added "Officers' Quarters only built at that time and occupied by Detachment, 1904."
N.W.M.P. Barracks at Fullerton Harbour, Nunavut. "Officers' Quarters only built at that time and occupied by Detachment, 1904."
The Labarum of Constantine I, reconstructed from the depiction on a follis minted c. 337. The three dots represent "medallions" which are said to have shown portraits of Constantine and his sons.[1]
L'orchestre du Titanic au grand complet : de gauche à droite et de haut en bas : George Krins, Wallace Hartley, Roger Bricoux, Theodore Brailey, Percy Taylor, Wes Woodward, John Clarke et John Hume.
English: Photographs of Titanic's musicians published by the Amalgated Musicians Union after the sinking. Français : Photographies des musiciens du Titanic publiées par le principal syndicat de la profession peu après le naufrage. Figurent de gauche à droite et de haut en bas : George Krins, Wallace Hartley, Roger Bricoux, Theodore Brailey, Percy Taylor, Wes Woodward, John Clarke et John Hume.
Insekt siše nektar jednog karanfila (Dianthus). Nektar je insektu potreban za preživljavanje, a karanfil biva oprašen pa može imati sjeme naredne generacije. Polinacija je klasični oblik mutualizma.
Hummingbird hawkmoth drinking from Dianthus Photo taken by Yummifruitbat in September 2005 using an Olympus C-750UZ
Ein Wasserzähler mit acht Ziffernrollen (schrittweise weiterdrehend), einem Zeiger (stufenlos weiterdrehend) und einem unbeschrifteten Indikator, der anzeigt, ob eine Ansprechschwelle überwunden ist
English: This image shows a detail of a Water meter. Deutsch: Dieses Bild zeigt einen Wasserzähler.
Retablu devocional domésticu d'Alemaña meridional (ca. 1500). Lo tardío de la fecha amuesa la pervivencia d'un gustu conservador nuna dómina na que les formes renacentistes terminaríen imponiéndose.
English: Home altar of the Annonciation. Southern Germany. Left panel : Visitation and Presentation of Jesus in Temple. Right panel : Nativity and adoration of Magi. Central panel : l'Annonciation. Français : Retable domestique l'Annonciation. Allemage du sud. Panneau de gauche : la Visitation et la Présentation de l'Enfant au temple. Panneau de droite : la Nativité et l'adoration des Mages. Panneau central : l'Annonciation.
Wolfsschanzes beliggenhet i dagens Europa. Anlegget ligger åtte kilometer øst for dagens Kętrzyn i Polen, som dengang det ble bygget var Rastenburg i Østpreussen, Det tyske rikes østligste landsdel.
Kidney donor cards from England, 1971–1981. The cards were made to be carried by donors as evidence that they were willing to donate their kidneys should they, for example, be killed in an accident.
Organ transplants are the best treatment for those with organ failure. Kidney donor cards, like this one, were introduced in the United Kingdom in 1971. There was and still is a shortage of donor organs and supplying the demand relies upon voluntary donations. The cards were made to be carried by donors as evidence that they were willing to donate their kidneys should they, for example, be killed in an accident. In 1981, the kidney donor cards were changed to include other organs such as the heart, liver, cornea and pancreas. The wishes of the 15.1 million donors in the United Kingdom are recorded on the National Health Service (NHS) Organ Donor Register, set up in 1994. There have long been calls to increase the numbers of potential donors by introducing an &#145;opt-out&#146; scheme to replace the &#145;opt-in&#146; system that exists at the moment. maker: Unknown maker Place made: England, United Kingdom Wellcome Images Keywords: Transplants; donor card; transplant
Figure 1: Closed triangulated polyhedra. (a) Tetrahedron (Td), (b) Trigonal bipyramid (D3h). (c) Octahedron (Oh). (d) Pentagonal bipyramid (D5d). (e) Capped octahedron (Cs). (f) Octadecahedron (C2r)
English: Closed triangulated polyhedra.
En avdeling fra den bulgarske nasjonalgarden paraderer i Paris i full gallauniform med snorbesatt attila (eller husarjakke) og liten kalpak (sylinderformet husarlue i pelsverk) med fjær som pompong.
English: A detachment of the National Guards Unit of Bulgaria marching in the 2007 Bastille Day military parade on the Avenue des Champs-Elysées in Paris Français : détachement de la Garde nationale bulgare au cours du défilé du 14 juillet 2007 sur les Champs Elysées à Paris
Harold schwört dem späteren Wilhelm dem Eroberer vor dessen Thron auf einem Reliquar den Treueid. Darstellung im 19. Jh. Der erzwungene Schwur wurde gebrochen, was bei der Handhaltung auch anklingt.
Harold Godwinson swears fealty to William the Conqueror.
Digital reconstruction giving an impression of Old St Paul's during the Middle Ages. The image is based on a model of the Cathedral in the Museum of London, composited with a modern city background.
English: Model of the Old St. Paul's Cathedral in the Museum of London. This model was made for the White City Exhibition in 1908 by J. B. Thorpe. This is a photographic impression of the cathedral made using the model and my own photographs as a background (it's actually Durham!). I would advise against viewing it full size - although it's fairly convincing when small, it wouldn't fool anyone once it's seen full size. Bob Castle (talk) 20:14, 8 September 2010 (UTC)
Axel Hervelle, basketeur, il joua avec le RBC Verviers-Pepinster, puis le Real Madrid et joue depuis 2010 avec le CBD Bilbao.Il fut récompensé du titre de Mérites sportifs de la Communauté française
Axel Hervelle
Das Wappen von Hugo Dietrich von Hohenlandenberg, Landkomtur der Deutschordensballei Schwaben-Elsass-Burgund (1594) zeigt die beiden Landenberger Wappen geviertet mit dem Wappen Deutschritterordens.
Deutsch: Wappen Hugo Dietrich von Hohenlandenberg, Landkomtur der Deutschordensballei Schwaben-Elsass-Burgund
Martin Behaimin Erdapfel, varhaisin tunnettu karttapallo, joka valmistui ennen kuin tieto Amerikan löytymisestä oli saavuttanut Euroopan; se osoittaa, että maan pallonmuoto tunnettiin jo sitä ennen.
Deutsch: Martin Behaims Erdapfel: Ältester bekannter und erhaltener Globus, welcher im Germanischen Nationalmuseum in Nürnberg aufbewahrt wird. English: Terrestrial globe named "Erdapfel" produced by Martin Behaim. Considered to be one of the oldest globes ever made.
Ruta de la expedición neerlandesa a Valdivia in 1643 en azul. La posesiones neerlandesas en azul también. El imperio Español en rojo, y las expediciones para la recolonización en 1645 en línea roja.
English: Map of the Spanish Empire and Dutch possesions in the Americas. The expedition of Brouwer is shown as blue line.
Peter van Bleeck: The Alchemist. Benjamin Griffin und Ben Jonson als Tribulation und Ananias in Jonsons Komödie The Alchemist. Handkolorierte Mezzotinto-Radierung, 1738 (Victoria and Albert Museum).
German: The Alchemist. Benjamin Griffin und Benjamin Johnson als Tribulation and Ananias im 3. Akt, 2. Szene von The Alchemist von Ben Jonson
Felixstowe F.2B[12] (N4545) in dazzle scheme during an anti-submarine patrol. The dazzle camouflage adopted aided identification during air combat and on the water in the event of being forced down.
English: Felixstowe F.2A in dazzle scheme in flight.
Galería de pinturas, óleo sobre lienzo, 176 x 210,5 cm, La Haya, Mauritshuis. Pintado en colaboración con Dirck van Delen y los autores de los cuadros originales, reproducidos aquí a pequeña escala.
Bei Antechinus agilis, einer Beuteltierart aus der Gattung der Breitfuß-Beutelmäuse, stirbt das Männchen unmittelbar nach der Paarung an den Folgen einer Überproduktion von Testosteron und Cortisol.
Agile Antechinus, Antechinus agilis, trapped during a uni field trip.
Playa in southwest Idaho, home to a number of rare species that occur nowhere else including Lepidium davisii (Davis' peppergrass) and Branchinecta raptor - a recently discovered giant fairy shrimp.
English: Playa in southwest Idaho, home to a number of rare species that occur nowhere else including Lepidium davisii (Davis' peppergrass) and Branchinecta raptor- a recently discovered giant fairy shrimp.
Map of Indian Territory and Oklahoma Territory in 1894, showing political subdivisions existing then. Both Territories ceased to exist November 16, 1907, when the State of Oklahoma became effective.
English: Map of Indian Territory and Oklahoma Territory in 1894, showing political subdivisions existing then. Both Territories ceased to exist November 16, 1907, when the State of Oklahoma became effective.
Walter Murch a Buenos Aires l'11 dicembre 2008Statuetta dell'Oscar Oscar al miglior sonoro 1980
Statuetta dell'Oscar Oscar al miglior montaggio 1997
Statuetta dell'Oscar Oscar al miglior sonoro 1997
English: Walter Murch working on Tetro in Buenos Aires, Argentina taken by Beatrice Murch
Una ilustración de cogordes en Annual report of the state botanist.
 1-4: Clavaria flava (Schaeff.) Quél. (1888); 5-7: Clavaria botrytis Pers. (1797); 8-12: Clavaria cristata (Holmsk.) Pers. (1801).
English: Title: Annual report of the state botanist Identifier: annualreportofst1897newy Year: 1897 (1890s) Authors: New York (State). State Botanist; Peck, Charles H. (Charles Horton), 1833-1917 Subjects: Botany -- New York (State); Fungi -- New York (State) Publisher: Albany, University of the State of New York Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: EDIBLE FUNGI. Plate 39 Text Appearing After Image: C FsuSEL.LlTM F1G9. 1 TO 4 CLAVARIA FLAVA schaeff. PALE-YELLOW CLAVARIA Figs, b to 7 CLAVARIA BOTRYTES Pebs. RED-TIPPED CLAVARIA FI08 8 TO 12 CLAVARIA CRISTATA pers. CRESTED CLAVARIA Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
Et kvadrangel beskrives ved fire hjørner  A, B, A'  og B' . De forbindes med seks sider. Disse skjærer hverandre i tre nye, diagonale punkt  D, E og F. Punktene A, B, C og D er harmonisk konjugerte.
English: Quadrangle to be used in projective geometry.
En detaljbild på sensorerna i nosen på en MH-60R. Längst till höger en FLIR, under den en datalänksändare och radarvarningsantenner på båda sidor om den. Underst skymtar den stora radarn AN/APS-124.
English: Nose of 166563 which is a United States Navy Sikorsky MH-60R Seahawk of HSM-40 on display at the 2010 Farnborough Airshow
Nègres marrons surpris par des chiens (1893) aussi connu comme Esclaves repris par les chiens, est une œuvre de Louis Samain, sise à Bruxelles, qui évoque un épisode du roman La Case de l'oncle Tom.
Français : Esclave repris par les chiens, par Louis Samain (1893).
Amerikanischer Panzer im befreiten Paris. Viele afrikanische und afroamerikanische oder afrokaribische Résistance-Kämpfer wie Frantz Fanon beeinflussten die postkoloniale Politik und Afrikaforschung
English: An M-8 "Greyhound" armored scout car of the US Army passes under the Arc de Triomphe after the liberation of Paris in August 1944. The identifying numbers of the vehicle were censored for security reasons, making it difficult to identify the unit. They appear to read "20X 20R-1" or "28X 28R-1", which would indicate a vehicle of the reconnaissance troop of the 20th or 28th Infantry Divisions. However, the image is captioned here as showing a vehicle of Troop B, 102nd Cavalry Reconnaissance Squadron, which was attached to the French 2nd Armored Division. Both the 102nd Cavalry and 20th Infantry were present at the liberation and in the parade that followed on the 29th. Türkçe: Zafer Takı'nın önünde ABD Kara Kuvvetleri'ne bağlı M8 Greyhound zırhlı arabası (Paris'in Kurtuluşu'nu kutlamak için 29 Ağustos 1944 tarihinde düzenlenen Zafer Töreni'nden sonra çekildi.)
Պետրոս I-ի ժամանակաշրջանի Սիբիրի նահանգապետի և Կանսի դարաշրջանի (1720) Չինաստանի կառավարության նամակագրությունից հատված։ Հրովարտակը հասցեագրված էր «գերագույն նախարար» «Նորին մեծություն Բոգդիխանովին»
English: Letter from the Peter I era government of Russia to the chief minister of the Kangxi Emperor of China, written in Saint Petersburg in early 1720 (January 9, 1720, if I read the date right) 中文: 1720年俄国给清政府的公文
Dakar-tydren: Wrak van die DAF FAV3600 95X2 TurboTwin wat op 9 Januarie 1988 verongeluk het in die Ténéré-kuswoestyn in die noorde van Niger, en waarin medebestuurder Kees van Loevezijn gesterf het.
Bildbeschreibung: Rallye Paris - Dakar, Wrack des im Januar 1988 mit Todesfolge (Kees van Loevezijn) verunglückten DAF FAV3600 95X2 TurboTwin in der nördlichen Ténéré-Kieswüste in Norden des Niger Quelle: eigene Aufnahme Bildautor: Holger Reineccius Datum: 24. Oktober 1989
Plejánov, en el centro, junto con otros delegados de la conferencia de la Internacional Socialista en Ámsterdam en 1904. Plejánov era para entonces una destacada figura del socialismo internacional.
Español: Delegados a la conferencia de Amsterdam de la Internacional Socialista en 1904. De izquierda a derecha, en primera fila: Cipriani, Toelstra, Hyndman, Berlfort Bax, Kringen, Katayama, Plejánov, Knudsen, Hillquit, Navroji, Anseele, y Ferri. En la segunda fila: Van Jol, Ugarte, Nemec, Vaillant, Soucup, Rosa Luxemburgo, Adler, Bracke, Kautsky, Walecki, Vandervelde, Cambier y Longuet.
Ao longo do rio São Lourenço, localiza-se a principal concentração industrial e populacional canadense. Na fotografia, vista do Rio São Lourenço na região das Mil Ilhas, entre Ontário e Nova Iorque.
Plan de la chapelle d'Édouard le Confesseur en l'abbaye de Westminster (le Nord est à droite). La tombe supposée de Sæberht se trouve à l'entrée du déambulatoire, face à la chapelle de saint Benoît.
English: Identifier: rollcallofwestmi00smit (find matches) Title: The roll-call of Westminster Abbey Year: 1906 (1900s) Authors: Smith, A. Murray, Mrs Subjects: Westminster Abbey Publisher: London : Smith, Elder, & Co. Contributing Library: Allen County Public Library Genealogy Center Digitizing Sponsor: Allen County Public Library Genealogy Center View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: his services to English literature ; he is also remembered asone of the founders of the Harleian Society. As a markof respect on the part of the Dean and Chapter Dr. Biadleyattended his funeral in the Nunhead Cemetery, and readthe burial service over his grave. The clarion call has ceased ; the many whose nameshave been omitted from these records must be left to restin peaceful obscurity—to await perhaps the researches offuture historians. Our labour of love is ended, and it isenough if these scattered memoirs of the past recall thenames not only of our famous English worthies, but ofthe obscurer, the too often forgotten Dead. PLAAT or THE SANCTUARY AND THE CHAPELS l?.f ail-Op*- ? m „ « rii* ^tff* ?* Si p.ft *-» I I A-Z Is i CHAPEL Jut O- ERASMUS • CHAPSL of C*<a*<W4 r/OA wax efhcies sr V • • II RtREDOS I _l • 1 I 1 #/C// AaBor Abbot 3 WENLOCK *MICHAEL ; Phali, Chapel S-JOHNEVANGT DoOK JLU» Mosaic PavementSanctuary Text Appearing After Image: Spottiswoode Poets Corner .?. 3^/js North Transept • • • ••• Lantern Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
A train at Mangotsfield in 1958, working a service to Bristol from the north. The photo is taken from the western end of the station, and shows the extensive glass canopies which were built in 1883.
Mangotsfield Station. 1958.
Frontbesuch 1916. Rechts vom Kardinal, mit hellem Mantel in die Kamera blickend, der Sekretär Konrad von Preysing; links hinter diesem, nur mit Kopf zu sehen, der andere Sekretär Michael Buchberger.
Deutsch: Frontbesuch des Münchener Kardinals Franziskus v. Bettinger 1916. Rechts vom Kardinal, mit hellem Mantel in die Kamera blickend, sein Sekretär Konrad v. Preysing (späterer Bischof von Eichstätt und Berlin); links hinter diesem, nur mit dem Kopf zu sehen, der andere Sekretär des Kardinals, Michael Buchberger (später Bischof von Regensburg). Rechts hinter Preysing steht Divisionspfarrer Jakob Weis (mit Bart).
US Navy 100212-N-4047W-021 Bottles of acyclovir and sterile water sit at the intravenous fluid mixing station in the pharmacy aboard the Military Sealift Command hospital ship USNS Comfort (T-AH 20)
English: PORT-AU-PRINCE, Haiti (Feb. 12, 2010) Bottles of acyclovir and sterile water sit at the intravenous fluid mixing station in the pharmacy aboard the Military Sealift Command hospital ship USNS Comfort (T-AH 20). Comfort is conducting humanitarian and disaster relief operations as part of Operation Unified Response after a 7.0 magnitude earthquake caused severe damage in and around Port-au-Prince, Haiti Jan. 12. (U.S. Navy photo by Mass Communication Specialist 2nd Class Shannon Warner/Released)
Représentation héraldique des comtes de Laval.
Enluminure sur parchemin, fo 78 vo, Armorial de Gilles Le Bouvier, dit Berry, héraut d'armes du roi Charles VII (XVe siècle), ms. 4985, Paris, BnF[18].
After winning the Cup, players traditionally skate around holding the trophy above their heads, as Pavel Datsyuk of the Detroit Red Wings does here when the Red Wings captured their 11th cup in 2008
Pavel Datsyuk, Detroit Red Wings, holds the Stanley Cup Русский: Па́вел Вале́рьевич Дацю́к Deutsch: Pawel Walerjewitsch Dazjuk
Tria-orda malalta-pasa filtrilo en topologio de Cauer. La filtrilo iĝas filtrilon de Butterworth kun fortranĉa frekvenco ωc=1 se (ekzemple) C2=4/3 faradoj, R4=1 omo, L1=3/2 henroj kaj L3=1/2 henroj.
Busto de Pedro Murias, monumento á entrada da granxa escola. A lenda di: "La Junta de Patronos de esta escuela reunida en la Habana en honra a la memoria de su fundador Don Pedro Murias y Rodríguez"
Galego: Busto de Pedro Murias, monumento á entrada da granxa escola. A lenda di: "La Junta de Patronos de esta escuela reunida en la Habana en honra a la memoria de su fundador Don Pedro Murias y Rodríguez"
Nữ ca sĩ người Canada Carly Rae Jepsen có đĩa đơn đầu tiên quán quân là "Call Me Maybe", đứng quán quân lâu nhất bảng xếp hạng, 9 tuần liên tiếp,[10] đồng hạng với "One More Night" của Maroon 5.[11]
View Large or Original. Carly Rae Jepsen at Canada Place, 2010 Canada Day Celebration View On Black
Análisis realizados por Ernest Hanbury Hankin en 1925, de patrones octogonales en la arquitectura mogola. Surgen estrellas de 8 puntas (abajo a la derecha) donde se cruzan las líneas negras gruesas.
Octagonal patterns in Mughal architecture
A Fornax-halmazról készült képen a röntgentsugárzó gáz kéknek látszik. Mindkét központi galaxis gáznyúlványokat húz maga utén, ami arra utal, hogy az egész halmaz egy ritkább felhő belsejében mozog.
English: Chandra's mosaic of images of the Fornax cluster reveals that the vast cloud of ten-million-degree Celsius gas in the core of the cluster has a swept-back cometary shape that extends for more than half a million light years. This geometry suggests that the hot gas cloud is moving through a larger, but less dense cloud of gas that creates an intergalactic headwind. The core motion, combined with optical observations of the motion of a group of galaxies falling toward the core, indicates that the cluster lies along a large, unseen, filamentary structure composed mostly of dark matter. Most galaxies, gas, and dark matter in the universe are thought to be concentrated in such filaments, and galaxy clusters are thought to form where the filaments intersect.