SuperComputer photos on Flickr

Installation of Dawn supercomputer by Lawrence Livermore National Laboratory (LLNL)

2 1

Dawn is #9 on the June 2009 Top500 list of the world's fastest supercomputers. Kim Cupps, High Performance Systems Division leader, and Mark Seager, assistant department head for New Technologies at Lawrence Livermore National Laboratory, inspect a newly installed rack for Dawn, a 500 teraFLOP/s (trillion floating operations per second) IBM BlueGene/P system. Dawn will help lay the foundation for the 20 petaFLOP/s (quadrillion floating operations per second) Sequoia system. [More info] Photo by Jacqueline McBride/LLNL

Wien, 3. Bezirk, Art of public places of Vienna - Ghegastraße/Kelsenstraße/Arsenalstraße (Arsenal/Schweizergarten - Suisse Garden) by Josef Lex (El buen soldado Švejk)

Arsenal (Vienna)

The Vienna Arsenal, object 1

(Pictures you can see by clicking on the link at the end of page!)

The Arsenal in Vienna is a former military complex in the southeast of the city, located in the 3rd district of Vienna. The mighty, consisting of several brick buildings facility is located on a rectangular plan on a hill south of the Country Road Belt (Landstraßer Gürtel).

Meaning

The Arsenal is the most important secular assembly of Romantic Historicism in Vienna and was conducted in Italian-Medieval and Byzantine-Moorish forms. Essentially the complex is preserved in its original forms; only the former workshop buildings within the bounding, from the the outside visible wings were replaced by new constructions.

History to 1945

Bird's eye view of the complex, arsenal, lithography Alexander Kaiser, 1855

Vienna Arsenal (Museum of Military History)

Arsenal, with HGM (Heeresgeschichtliches Museum) from the East

The complex, with a total of 31 "objects" (buildings) was built from 1849 to 1856 on the occasion of the March Revolution of 1848 and was the first building of the fortress triangle, replacing the old Vienna's city walls, with the Rossauer Barracks and the now-defunct Franz Joseph barracks at Stubenring. These buildings should not serve to deter foreign enemies from the city, but to secure state power in the event of revolutionary upheavals in Vienna. The decision to build the Arsenal, it came from the 19-year-old Emperor Franz Joseph I who on 2 December 1848 had come to the throne.

The design for the Imperial Artillery Arsenal came from General Artillery Director Vincenz Freiherr von Augustin, to which, subsequently, the site management had been transferred. Under his leadership, the buildings under assignment of sectors have been planned of the architects Carl Roesner, Antonius Pius de Riegel, August Sicard von Sicardsburg, Eduard van der Nüll, Theophil von Hansen and Ludwig Förster and built by the company of the architect Leopold Mayr.

From 1853 to 1856, Arsenal church was built by the architect Carl Roesner. The K.K. Court Weapon Museum, later K.K. Army Museum, now Museum of Military History, housed in a separate representative free-standing wing, was completed structurally in 1856, but was only in 1869 for the first time accessible.

For the construction of the Arsenal 177 million bricks were used. Construction costs totaled $ 8.5 million guilders. In the following years, there have been extensions. During the two world wars, the complex served as a weapons factory and arsenal, especially as barracks.

The record number of employees in Arsenal was reached in the First World War, with around 20,000 staffers. After 1918, the military-industrial operation with own steel mill was transformed into a public service institution with the name "Austrian Factories Arsenal". However, there were almost insoluble conversion problems in the transition to peacetime production, the product range was too great and the mismanagement considerable. The number of employees declined steadily, and the company became one of the great economic scandals of the First Republic.

By the fall of 1938, the area belonged to the 10th District Favoriten. However, as was established during the "Third Reich" the Reich District of Greater Vienna, became the arsenal complex and the south-east of it lying areas in the wake of district boundary changes parts of the 3rd District.

During the Second World War, in the Arsenal tank repair workshops of the Waffen-SS were set up. In the last two years of the war several buildings were severely damaged by bombing. During the Battle of Vienna, in the days of 7 to 9 April 1945, was the arsenal, defended by the 3rd SS Panzer Division "Totenkopf", focus of the fighting, the Red Army before its victory facing heavy losses.

History since 1945

Ruins of the object 15 after the air raids 1944

Deposits at the Arsenal Street

After heavy bomb damages during the Second World War, the buildings of the Arsenal were largely restored to their original forms.

In the southern part and in the former courtyard of the arsenal several new buildings were added, among them 1959-1963 the decoration workshops of the Federal Theatre designed by the architects Erich Boltenstern and Robert Weinlich. From 1961 to 1963, the telecommunications central office was built by the architect Fritz Pfeffer. From 1973 to 1975 were built operation and office building of the Post and Telephone Head Office for Vienna, Lower Austria and Burgenland (now Technology Centre Arsenal of Telekom Austria) with the 150-meter high radio tower in Vienna Arsenal according to the plans of architect Kurt Eckel. In the 1990s, a rehearsal stage of the Castle Theater (Burgtheater) was built according to plans by Gustav Peichl.

Also the Austrian Research and Testing Centre Arsenal, now Arsenal Research, which has made itself wordwide a celebrity by one of the largest air chambers (now moved to Floridsdorf - 21st District), was housed in the complex. A smaller part of the complex is still used by the Austrian army as a barracks. Furthermore, the Central Institute for Disinfection of the City of Vienna and the Central Chemical Laboratory of the Federal Monuments Office are housed in the arsenal. The Military History Museum uses multiple objects as depots.

In one part of the area residential buildings were erected. The Arsenal is forming an own, two census tracts encompassing census district, which according to the census in 2001 had 2.058 inhabitants.

End of 2003, the arsenal in connection with other properties of the Federal Property Society (BIG - Bundesimmobiliengesellschaft) was sold to a private investor group. Since early 2006, the lawyer of Baden (Lower Austria, not far away from Vienna) Rudolf Fries and industrialist Walter Scherb are majority owners of the 72,000 m2 historic site that they want to refurbish and according to possibility rent new. Fries also plans to enlarge the existing living space by more than a half (about 40,000 m2).

An architectural design competition, whose jury on 28 and 29 in June 2007 met, provided proposals amounting to substantial structural changes in the complex. Such designed competition winner Hohensinn a futuristic clouds clip modeled after El Lissitzky's cloud bracket, a multi-level horizontal structure on slender stilts over the old stock on the outskirts of the Swiss Garden. The realization of these plans is considered unlikely.

Some objects are since 2013 adapted for use by the Technical University of Vienna: Object 227, the so-called "Panzerhalle" will house laboratories of the Institute for Powertrains and Automotive Technology. In object 221, the "Siemens hall", laboratories of the Institute for Energy Technology and Thermodynamics as well as of the Institute for Manufacturing Technology and High Power Laser Technology are built. In object 214 is besides the Technical Testing and Research Institute (TVFA) also the second expansion stage of the "Vienna Scientific Cluster" housed, of a supercomputer, which was built jointly by the Vienna University of Technology, the University of Vienna and the University of Agricultural Sciences.

Accessibility

The arsenal was historically especially over the Landstraßer Gürtel developed. Today passes southeast in the immediate proximity the Südosttangente called motorway A23 with it connection Gürtel/Landstraßer Hauptstrasse. Southwest of the site runs the Eastern Railway, the new Vienna Central Station closes to the west of the arsenal. Two new bridges over the Eastern Railway, the Arsenal Stay Bridge and the Southern Railway bridge and an underpass as part of Ghegastraße and Alfred- Adler-Straße establish a connection to the on the other side of the railway facilities located Sonnwendviertel in the 10th District, which is being built on the former site of the freight train station Vienna South Station.

On the center side is between Arsenal and Landstraßer Gürtel the former Maria Josefa Park located, now known as Swiss Garden. Here stands at the Arsenal street the 21er Haus, a branch of the Austrian Gallery Belvedere, on the center-side edge of the Swiss Garden has the busy suburban main railway route the stop Vienna Quartier Belvedere, next to it the Wiener Linien D (tram) and 69A (bus) run.

de.wikipedia.org/wiki/Arsenal_(Wien)

Answer to the Ultimate Question of Life, the Universe, and Everything (42). In the first novel and radio series, a group of hyper-intelligent pan-dimensional beings demand to learn the Answer to the Ultimate Question of Life, The Universe, and Everything by Jeff Ferguson

Answer to the Ultimate Question of Life, the Universe, and Everything (42). In the first novel and radio series, a group of hyper-intelligent pan-dimensional beings demand to learn the Answer to the Ultimate Question of Life, The Universe, and Everything from the supercomputer, Deep Thought, specially built for this purpose. It takes Deep Thought 7½ million years to compute and check the answer, which turns out to be 42. The Ultimate Question itself is unknown. When asked to produce The Ultimate Question, Deep Thought says that it cannot; however, it can help to design an even more powerful computer, the Earth, that can. The programmers then embark on a further ten-million-year program to discover The Ultimate Question. This new computer will incorporate living beings in the "computational matrix", with the pan-dimensional creators assuming the form of mice. The process is hindered after eight million years by the unexpected arrival on Earth of the Golgafrinchans and then is ruined completely, five minutes before completion, when the Earth is destroyed by the Vogons to make way for a new Hyperspace Bypass. This is later revealed to have been a ruse: the Vogons had been hired to destroy the Earth by a consortium of psychiatrists, led by Gag Halfrunt, who feared for the loss of their careers when the meaning of life became known. Lacking a real question, the mice decide not to go through the whole thing again and settle for the out-of-thin-air suggestion "How many roads must a man walk down?" from Bob Dylan's song "Blowin' in the Wind". At the end of the radio series (and television series, as well as the novel The Restaurant at the End of the Universe) Arthur Dent, having escaped the Earth's destruction, potentially has some of the computational matrix in his brain. He attempts to discover The Ultimate Question by extracting it from his brainwave patterns, as abusively suggested by Ford Prefect, when a Scrabble-playing caveman spells out forty two. Arthur pulls random letters from a bag, but only gets the sentence "What do you get if you multiply six by nine?" "Six by nine. Forty two." "That's it. That's all there is." "I always thought something was fundamentally wrong with the universe" Six times nine is, of course, fifty-four. The program on the "Earth computer" should have run correctly, but the unexpected arrival of the Golgafrinchans on prehistoric Earth caused input errors into the system—computing (because of the garbage in, garbage out rule) the wrong question—the question in Arthur's subconscious being invalid all along. Quoting Fit the Seventh of the radio series, on Christmas Eve, 1978: Narrator: There is a theory which states that if ever anyone discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another theory which states that this has already happened. Some readers subsequently noticed that 613 × 913 = 4213 (using base 13). Douglas Adams later joked about this observation, saying, "I may be a sorry case, but I don't write jokes in base 13." In Life, the Universe and Everything, Prak, a man who knows all that is true, confirms that 42 is indeed The Answer, and confirms that it is impossible for both The Answer and The Question to be known about in the same universe (compare the uncertainty principle) as they will cancel each other out and take the Universe with them to be replaced by something even more bizarre (as described in the first theory) and that it may have already happened (as described in the second). Though the question is never found, 42 is shown as the table number at which Arthur and his friends sit when they arrive at Milliways at the end of the radio series. Likewise, Mostly Harmless ends when Arthur stops at a street address identified by his cry of, "There, number 42!" and enters the club Beta, owned by Stavro Mueller (Stavromula Beta). Shortly after, the earth is destroyed in all existing incarnations. The number 42 Douglas Adams was asked many times why he chose the number 42. Many theories were proposed, including the fact that 42 is 101010 in binary code, the fact that light refracts off water by 42 degrees to create a rainbow, the fact that light requires 10−42 seconds to cross the diameter of a proton. Adams rejected them all. On November 3, 1993, he gave an answer on alt.fan.douglas-adams: The answer to this is very simple. It was a joke. It had to be a number, an ordinary, smallish number, and I chose that one. Binary representations, base thirteen, Tibetan monks are all complete nonsense. I sat at my desk, stared into the garden and thought '42 will do'. I typed it out. End of story. Adams described his choice as 'a completely ordinary number, a number not just divisible by two but also six and seven. In fact it's the sort of number that you could without any fear introduce to your parents'. While 42 was a number with no hidden meaning, Adams explained in more detail in an interview with Iain Johnstone of BBC Radio 4 (recorded in 1998 though never broadcast) to celebrate the first radio broadcast's 20th anniversary. Having decided it should be a number, he tried to think what an "ordinary number" should be. He ruled out non-integers, then he remembered having worked as a "prop-borrower" for John Cleese on his Video Arts training videos. Cleese needed a funny number for the punchline to a sketch involving a bank teller (himself) and a customer (Tim Brooke-Taylor). Adams believed that the number that Cleese came up with was 42 and he decided to use it. Adams also had written a sketch for The Burkiss Way called "42 Logical Positivism Avenue", broadcast on BBC Radio 4 on 12 January 1977[10] – 14 months before the Hitchhiker's Guide first broadcast "42" in fit the fourth, 29 March 1978. In January 2000, in response to a panelist's "Where does the number 42 come from?" on the radio show "Book Club" Adams explained that he was "on his way to work one morning, whilst still writing the scene, and was thinking about what the actual answer should be. He eventually decided that it should be something that made no sense whatsoever- a number, and a mundane one at that. And that is how he arrived at the number 42, completely at random." Stephen Fry, a friend of Adams, claims that Adams told him "exactly why 42", and that the reason is "fascinating, extraordinary and, when you think hard about it, completely obvious." However, Fry says that he has vowed not to tell anyone the secret, and that it must go with him to the grave. John Lloyd, Adams' collaborator on The Meaning of Liff and two Hitchhiker's fits, said that Douglas has called 42 "the funniest of the two-digit numbers." The number 42 also appears frequently in the work of Lewis Carroll, and some critics have suggested that this was an influence. Other purported Carroll influences include that Adams named the episodes of the original radio series of The Hitchhiker's Guide to the Galaxy "fits", the word Carroll used to name the chapters of The Hunting of the Snark. There is the persistent tale that forty-two is actually Adams' tribute to the indefatigable paperback book, and is really the average number of lines on an average page of an average paperback book. On the Internet The number 42 and the phrase, "Life, the universe, and everything" have attained cult status on the Internet. "Life, the Universe, and Everything" is a common name for the off-topic section of an Internet forum and the phrase is invoked in similar ways to mean "anything at all". Many chatbots, when asked about the meaning of life, will answer "42". Several online calculators are also programmed with the Question. If you type the answer to life the universe and everything into Google (without quotes or capitalising the small words), the Google Calculator will give you 42, as will Wolfram's Computational Knowledge Engine. Similarly, if you type the answer to the ultimate question of life, the universe and everything into DuckDuckGo, the 0-click box will read "42".[19] In the online community Second Life, there is a section on a sim called "42nd Life." It is devoted to this concept in the book series, and several attempts at recreating Milliways, the Restaurant at the End of the Universe, were made. In the OpenOffice.org software, if you type into any cell of a spreadsheet =ANTWORT("Das Leben, das Universum und der ganze Rest"), which means the answer to life, the universe and everything, the result is 42.[20] ISO/IEC 14519-2001/ IEEE Std 1003.5-1999, IEEE Standard for Information Technology - POSIX(R) Ada Language Interfaces - Part 1: Binding for System Application Program Interface (API) , uses the number '42' as the required return value from a process that terminates due to an unhandled exception. The Rationale says "the choice of the value 42 is arbitrary" and cites the Adams book as the source of the value. The random seed chosen to procedurally create the whole universe including all the regions, constellations, stars, planets, moons and mineral distribution of the online massively multi-player computer game EVE Online was chosen as 42 by its lead game designer in 2002. Cultural references The Allen Telescope Array, a radio telescope used by SETI, has 42 dishes in homage to the Answer. In the TV show Lost, 42 is the last of the mysterious numbers, 4, 8, 15, 16, 23, and 42. In an interview with Lostpedia, producer David Fury confirmed this was a reference to Hitchhiker's. The TV show The Kumars at No. 42 is so named because show creator Sanjeev Bhaskar is a Hitchhiker's fan.[24] The band Coldplay's album Viva la Vida includes a song called "42". When asked by Q magazine if the song's title was Hitchhiker's-related, Chris Martin said, "It is and it isn't." The band Level 42 chose its name in reference to the book. The episode "42" of the British science fiction television series Doctor Who was named in reference to the Answer. Writer Chris Chibnall acknowledged that "it's a playful title". Ken Jennings, defeated along with Brad Rutter in a Jeopardy match against IBM's Watson, writes that Watson's avatar which appeared on-screen for those games showed 42 "threads of thought," and that the number was chosen in reference to this meme. by Jeff Ferguson

Wien, 3. Bezirk, Arsenal - Kirche Maria vom Siege, la chiesa di Santa Maria della Vittoria, la iglesia de Santa María de la Victoria, l'église de Sainte Marie de la Victoire, the Church of Saint Mary of the Victory by Josef Lex (El buen soldado Švejk)

Arsenal (Vienna)

The Vienna Arsenal, object 1

(Pictures you can see by clicking on the link at the end of page!)

The Arsenal in Vienna is a former military complex in the southeast of the city, in the 3rd District of Vienna located. The mighty, consisting of several brick buildings facility is located on a rectangular plan on a hill south of the country Strasser belt (Landstraßer Gürtel).

Meaning

The Arsenal is the most important secular assembly of Romantic Historicism in Vienna and was conducted in Italian-Medieval and Byzantine-Moorish forms. Essentially the system is preserved in its original forms; only the former workshop buildings within the bounding, from the the outside visible wings were replaced by new constructions.

History to 1945

Bird's eye view of the complex, arsenal, lithography Alexander Kaiser, 1855

Vienna Arsenal (Museum of Military History)

Arsenal, with HGM (Heeresgeschichtliches Museum) from the East

The plant, with a total of 31 "objects" (buildings) was built from 1849 to 1856 on the occasion of the March Revolution of 1848 and was the first building of the fortress triangle, the old Vienna's city walls replacing, with the Rossauerstrasse Barracks and the now-defunct Franz Joseph barracks at Stubenring. These buildings should not serve to deter foreign enemies from the city, but to secure state power in the event of revolutionary upheavals in Vienna. The decision to build the Arsenal, it came from the 19-year-old Emperor Franz Joseph I who on 2 December 1848 had come to the throne.

The design for the Imperial Artillery Arsenal came from General Artillery Director Vincenz Freiherr von Augustin, which, subsequently, the site management had been transferred. Under his leadership, the buildings under allocation of sectors have been planned of the architects Carl Roesner, Antonius Pius de Riegel, August Sicard von Sicardsburg, Eduard van der Nüll, Theophil von Hansen and Ludwig Förster and built by the company of the architect Leopold Mayr.

From 1853 to 1856, Arsenal church was built by the architect Carl Roesner. The K.K. Court Weapon Museum, later K.K. Army Museum, now Museum of Military History, housed in a separate representative free-standing wing, was completed structurally in 1856, but was only in 1869 for the first time accessible.

For the construction of the Arsenal 177 million bricks were used. Construction costs totaled $ 8.5 million guilders. In the following years, there have been extensions. During the two world wars, the complex served as a weapons factory and arsenal, especially as barracks.

The record number of employees in Arsenal was reached in the First World War, with around 20,000 staffers. After 1918, the military-industrial operation with own steel mill was transformed into a public service institution with the name "Austrian art arsenal". However, there were almost insoluble conversion problems in the transition to peacetime production, the product range was too great and the mismanagement considerable. The number of employees declined steadily, and the company became one of the great economic scandals of the First Republic.

By the fall of 1938, the area belonged to the 10th District Favoriten. However, as was established during the "Third Reich" the Reich District of Greater Vienna the arsenal complex and the south-east of it lying areas in the wake of district boundary changes became parts of the 3rd District.

During the Second World War, in the Arsenal tank repair workshops of the Waffen-SS were set up. In the last two years of the war several buildings were severely damaged by bombing. During the Battle of Vienna, in the days of 7 to 9 April 1945, was the arsenal, defended by the 3rd SS Panzer Division "Totenkopf", focus of the fighting, the Red Army before their victory recording heavy losses.

History since 1945

Ruins of the object 15 after the air raids 1944

Deposits at the Arsenal Street

After heavy bomb damages during the Second World War, the buildings of the Arsenal were largely restored to their original forms.

In the southern part and in the former courtyard of the arsenal several new buildings were added, among them 1959-1963 the decoration workshops of the Federal Theatre designed by the architects Erich Boltenstern and Robert Weinlich. From 1961 to 1963, the telecommunications central office was built by the architect Fritz Pfeffer. From 1973 to 1975 were built plant and office building of the Post and Telephone Head Office for Vienna, Lower Austria and Burgenland (now Technology Centre Arsenal of Telekom Austria) with the 150-foot radio tower in Vienna Arsenal according to the plans of architect Kurt Eckel. In the 1990s, a rehearsal stage of the castle theater (Burgtheater) was built according to plans by Gustav Peichl.

Also the Austrian Research and Testing Centre Arsenal, now Arsenal Research, which has made itself wordwide a celebrity by one of the largest air chambers (now moved to Floridsdorf - 21st District ), was housed in the complex. A smaller part of the system is still used by the Austrian army as a barracks. Furthermore, the Central Institute for Disinfection of the City of Vienna and the Central Chemical Laboratory of the Federal Monuments Office are housed in the arsenal. The Military History Museum uses multiple objects as depots.

In one part of the area residential buildings were erected. The Arsenal is forming an own, two census tracts encompassing census district, which according to the census in 2001 2.058 inhabitants had.

End of 2003, the arsenal in connection with other properties of the Federal Property Society (BIG - Bundesimmobiliengesellschaft) was sold to a private investor group. Since early 2006, the lawyer of Baden (Lower Austria, not far away from Vienna) Rudolf Fries and industrialist Walter Scherb are majority owners of the 72,000 m2 historic site that they want to refurbish and according to possibility rent new. Fries also plans to enlarge the existing living space by more than half (about 40,000 m2).

An architectural design competition, whose jury on 28 and 29 in June 2007 met, provided proposals amounting to substantial structural changes in the system. Such designed competition winner Hohensinn a futuristic clouds clip modeled after El Lissitzky's cloud bracket, a multi-level horizontal structure on slender stilts over the old stock on the outskirts of the Swiss Garden. The realization of these plans is considered unlikely.

Some objects are since 2013 adapted for use by the Technical University of Vienna: Object 227, the so-called "Panzerhalle" will house laboratories of the Institute for Powertrains and Automotive Technology. In object 221, the "Siemens hall", laboratories of the Institute for Energy Technology and Thermodynamics as well as of the Institute for Manufacturing Technology and High Power Laser Technology are built. In object 214 is besides the Technical Testing and Research Institute (TVFA) also the second expansion stage of the "Vienna Scientific Cluster" housed, of a supercomputer, which was built jointly by the Vienna University of Technology, the University of Vienna and the University of Agricultural Sciences.

Accessibility

The arsenal was historically especially over the Landstraßer Gürtel developed. Today passes southeast in the immediate proximity the Südosttangente called motorway A23 with it connection Gürtel/Landstraßer Hauptstrasse. Southwest of the site runs the Eastern Railway, the new Vienna Central Station closes to the west of the arsenal. Two new bridges over the Eastern Railway, the Arsenal Stay Bridge and the Southern Railway bridge and an underpass as part of Ghegastraße and Alfred- Adler-Straße establish a connection to the on the other side of the railway facilities located Sonnwendviertel in the 10th District, which is being built on the former site of the freight train station Vienna South Station.

On the center side is between Arsenal and Landstraßer Gürtel the former Maria Josefa Park located, now known as Swiss Garden. Here stands at the Arsenalstraße the 21er Haus, a branch of the Austrian Gallery Belvedere, on the center-side edge of the Swiss Garden has the busy suburban main railway route the stop Vienna Quartier Belvedere, next to it the Wiener Linien D (tram) and 69A (bus) run.

de.wikipedia.org/wiki/Arsenal_(Wien)

Black Hole Event Horizon, variant by Stuart Rankin

Edited Event Horizon Telescope image of a black hole in the the galaxy M87. What you see here isn't the actual black hole but material tat has been heated to super-hot temperatures and glows as a result of being so close to the black hole and rubbing against other particles. Larger image to follow. Inverted grayscale variant.

Image source: eventhorizontelescope.org/

First original caption: Scientists have obtained the first image of a black hole, using Event Horizon Telescope observations of the center of the galaxy M87. The image shows a bright ring formed as light bends in the intense gravity around a black hole that is 6.5 billion times more massive than the Sun. This long-sought image provides the strongest evidence to date for the existence of supermassive black holes and opens a new window onto the study of black holes, their event horizons, and gravity. Credit: Event Horizon Telescope Collaboration

Second original caption: Astronomers Capture First Image of a Black Hole

An international collaboration presents paradigm-shifting observations of the gargantuan black hole at the heart of distant galaxy Messier 87

The Event Horizon Telescope (EHT) — a planet-scale array of eight ground-based radio telescopes forged through international collaboration — was designed to capture images of a black hole. Today, in coordinated press conferences across the globe, EHT researchers reveal that they have succeeded, unveiling the first direct visual evidence of a supermassive black hole and its shadow.

This breakthrough was announced today in a series of six papers published in a special issue of The Astrophysical Journal Letters. The image reveals the black hole at the center of Messier 87 [1], a massive galaxy in the nearby Virgo galaxy cluster. This black hole resides 55 million light-years from Earth and has a mass 6.5 billion times that of the Sun [2].

The EHT links telescopes around the globe to form an Earth-sized virtual telescope with unprecedented sensitivity and resolution [3]. The EHT is the result of years of international collaboration, and offers scientists a new way to study the most extreme objects in the Universe predicted by Einstein’s general relativity during the centennial year of the historic experiment that first confirmed the theory [4].

"We have taken the first picture of a black hole," said EHT project director Sheperd S. Doeleman of the Center for Astrophysics | Harvard & Smithsonian. "This is an extraordinary scientific feat accomplished by a team of more than 200 researchers."

Black holes are extraordinary cosmic objects with enormous masses but extremely compact sizes. The presence of these objects affects their environment in extreme ways, warping spacetime and super-heating any surrounding material.

"If immersed in a bright region, like a disc of glowing gas, we expect a black hole to create a dark region similar to a shadow — something predicted by Einstein’s general relativity that we’ve never seen before, explained chair of the EHT Science Council Heino Falcke of Radboud University, the Netherlands. "This shadow, caused by the gravitational bending and capture of light by the event horizon, reveals a lot about the nature of these fascinating objects and allowed us to measure the enormous mass of M87’s black hole."

Multiple calibration and imaging methods have revealed a ring-like structure with a dark central region — the black hole’s shadow — that persisted over multiple independent EHT observations.

"Once we were sure we had imaged the shadow, we could compare our observations to extensive computer models that include the physics of warped space, superheated matter and strong magnetic fields. Many of the features of the observed image match our theoretical understanding surprisingly well," remarks Paul T.P. Ho, EHT Board member and Director of the East Asian Observatory [5]. "This makes us confident about the interpretation of our observations, including our estimation of the black hole’s mass."

Creating the EHT was a formidable challenge which required upgrading and connecting a worldwide network of eight pre-existing telescopes deployed at a variety of challenging high-altitude sites. These locations included volcanoes in Hawai`i and Mexico, mountains in Arizona and the Spanish Sierra Nevada, the Chilean Atacama Desert, and Antarctica.

The EHT observations use a technique called very-long-baseline interferometry (VLBI) which synchronises telescope facilities around the world and exploits the rotation of our planet to form one huge, Earth-size telescope observing at a wavelength of 1.3 mm. VLBI allows the EHT to achieve an angular resolution of 20 micro-arcseconds — enough to read a newspaper in New York from a sidewalk café in Paris [6].

The telescopes contributing to this result were ALMA, APEX, the IRAM 30-meter telescope, the James Clerk Maxwell Telescope, the Large Millimeter Telescope Alfonso Serrano, the Submillimeter Array, the Submillimeter Telescope, and the South Pole Telescope [7]. Petabytes of raw data from the telescopes were combined by highly specialised supercomputers hosted by the Max Planck Institute for Radio Astronomy and MIT Haystack Observatory.

The construction of the EHT and the observations announced today represent the culmination of decades of observational, technical, and theoretical work. This example of global teamwork required close collaboration by researchers from around the world. Thirteen partner institutions worked together to create the EHT, using both pre-existing infrastructure and support from a variety of agencies. Key funding was provided by the US National Science Foundation (NSF), the EU's European Research Council (ERC), and funding agencies in East Asia.

"We have achieved something presumed to be impossible just a generation ago," concluded Doeleman. "Breakthroughs in technology, connections between the world's best radio observatories, and innovative algorithms all came together to open an entirely new window on black holes and the event horizon."

Notes

[1] The shadow of a black hole is the closest we can come to an image of the black hole itself, a completely dark object from which light cannot escape. The black hole’s boundary — the event horizon from which the EHT takes its name — is around 2.5 times smaller than the shadow it casts and measures just under 40 billion km across.

[2] Supermassive black holes are relatively tiny astronomical objects — which has made them impossible to directly observe until now. As a black hole’s size is proportional to its mass, the more massive a black hole, the larger the shadow. Thanks to its enormous mass and relative proximity, M87’s black hole was predicted to be one of the largest viewable from Earth — making it a perfect target for the EHT.

[3] Although the telescopes are not physically connected, they are able to synchronize their recorded data with atomic clocks — hydrogen masers — which precisely time their observations. These observations were collected at a wavelength of 1.3 mm during a 2017 global campaign. Each telescope of the EHT produced enormous amounts of data — roughly 350 terabytes per day — which was stored on high-performance helium-filled hard drives. These data were flown to highly specialised supercomputers — known as correlators — at the Max Planck Institute for Radio Astronomy and MIT Haystack Observatory to be combined. They were then painstakingly converted into an image using novel computational tools developed by the collaboration.

[4] 100 years ago, two expeditions set out for the island of Príncipe off the coast of Africa and Sobra in Brazil to observe the 1919 solar eclipse, with the goal of testing general relativity by seeing if starlight would be bent around the limb of the sun, as predicted by Einstein. In an echo of those observations, the EHT has sent team members to some of the world's highest and isolated radio facilities to once again test our understanding of gravity.

[5] The East Asian Observatory (EAO) partner on the EHT project represents the participation of many regions in Asia, including China, Japan, Korea, Taiwan, Vietnam, Thailand, Malaysia, India and Indonesia.

[6] Future EHT observations will see substantially increased sensitivity with the participation of the IRAM NOEMA Observatory, the Greenland Telescope and the Kitt Peak Telescope.

[7] ALMA is a partnership of the European Southern Observatory (ESO; Europe, representing its member states), the U.S. National Science Foundation (NSF), and the National Institutes of Natural Sciences (NINS) of Japan, together with the National Research Council (Canada), the Ministry of Science and Technology (MOST; Taiwan), Academia Sinica Institute of Astronomy and Astrophysics (ASIAA; Taiwan), and Korea Astronomy and Space Science Institute (KASI; Republic of Korea), in cooperation with the Republic of Chile. APEX is operated by ESO, the 30-meter telescope is operated by IRAM (the IRAM Partner Organizations are MPG (Germany), CNRS (France) and IGN (Spain)), the James Clerk Maxwell Telescope is operated by the EAO, the Large Millimeter Telescope Alfonso Serrano is operated by INAOE and UMass, the Submillimeter Array is operated by SAO and ASIAA and the Submillimeter Telescope is operated by the Arizona Radio Observatory (ARO). The South Pole Telescope is operated by the University of Chicago with specialized EHT instrumentation provided by the University of Arizona.

More Information

This research was presented in a series of six papers published today in a special issue of The Astrophysical Journal Letters, along with a Focus Issue:

Paper I: The Shadow of the Supermassive Black Hole

Paper II: Array and Instrumentation

Paper III: Data processing and Calibration

Paper IV: Imaging the Central Supermassive Black Hole

Paper V: Physical Origin of the Asymmetric Ring

Paper VI: The Shadow and Mass of the Central Black Hole

Press release images in higher resolution (4000x2330 pixels) can be found here in PNG (16-bit), and JPG (8-bit) format. The highest-quality image (7416x4320 pixels, TIF, 16-bit, 180 Mb) can be obtained from repositories of our partners, NSF and ESO. A summary of latest press and media resources can be found on this page.

The EHT collaboration involves more than 200 researchers from Africa, Asia, Europe, North and South America. The international collaboration is working to capture the most detailed black hole images ever by creating a virtual Earth-sized telescope. Supported by considerable international investment, the EHT links existing telescopes using novel systems — creating a fundamentally new instrument with the highest angular resolving power that has yet been achieved.

The individual telescopes involved are; ALMA, APEX, the IRAM 30-meter Telescope, the IRAM NOEMA Observatory, the James Clerk Maxwell Telescope (JCMT), the Large Millimeter Telescope Alfonso Serrano (LMT), the Submillimeter Array (SMA), the Submillimeter Telescope (SMT), the South Pole Telescope (SPT), the Kitt Peak Telescope, and the Greenland Telescope (GLT).

The EHT collaboration consists of 13 stakeholder institutes; the Academia Sinica Institute of Astronomy and Astrophysics, the University of Arizona, the University of Chicago, the East Asian Observatory, Goethe-Universitaet Frankfurt, Institut de Radioastronomie Millimétrique, Large Millimeter Telescope, Max Planck Institute for Radio Astronomy, MIT Haystack Observatory, National Astronomical Observatory of Japan, Perimeter Institute for Theoretical Physics, Radboud University and the Smithsonian Astrophysical Observatory.

Contact Information

Sheperd S. Doeleman

EHT Collaboration Director

Center for Astrophysics | Harvard & Smithsonian

60 Garden Street, Cambridge, MA 02138

E-mail: sdoeleman@cfa.harvard.edu

Phone: +1-617-496-7762

Peter D. Edmonds

Public Information Officer

Center for Astrophysics | Harvard & Smithsonian

60 Garden Street, Cambridge, MA 02138

E-mail: pedmonds@cfa.harvard.edu

Phone: +1-617-571-7279

EHT Outreach Working Group

E-mail: ehtelescope@gmail.com

Cray Y - MP Wires by Lawrence Livermore National Laboratory (LLNL)

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The Cray Y-MP/832 supercomputer was installed at Lawrence Livermore National Laboratory in February 1989; acceptance testing was completed in April. About 20 times faster than a Cray 1, the new Cray Y MP/832 was the fastest supercomputer available at the time on some benchmark tests. The system used the Lab’s New Network Livermore Time Sharing System as its standard operating system.

Cray Y - MP by Lawrence Livermore National Laboratory (LLNL)

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The Cray Y-MP 832 super computer was installed at Lawrence Livermore National Laboratory in February 1989; acceptance testing was completed in April. About 20 times faster than a Cray 1, the new YMP-832 was the fastest supercomputer available at the time on some benchmark tests. The system used the Lab’s New Network Livermore Time Sharing System as its standard operating system.

Cray X MP-48 People by Lawrence Livermore National Laboratory (LLNL)

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In 1988, Lawrence Livermore National Laboratory installed the first totally new supercomputer operating system in 20 years on the Livermore Computer Center’s (LCC) Cray X/MP/48. The new Network Livermore Timesharing System (NLTSS) replaced the old Livermore Timesharing System. Nearly five years in design and four years in implementation, NLTSS was a state-of-the-art distributed processing system, providing more efficient use both of the center’s powerful multiprocessor supercomputers and the researcher’s own enhanced workstation.

Classic Space Mansion - 10228 MOD - inside by Murdoch17

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Inside the house on the lower floor is TV with VCR player, couch, lamp, table and stove, along with stairs to the second floor. The second level features Benny's bed, curio cabinet, Classic space supercomputer (seen here: www.flickr.com/photos/55973205@N08/42411588174/in/album-7... ) and a model rocket. The attic floor features a model city with monorail and a vintage '80's video-game arcade cabinet. You get to the attic by pulling the outside pin which causes the attic ladder to fold down automatically.

The house opens and closes on four hinges, and locks shut on a single Technic pin.

New York Blue Supercomputer by Brookhaven National Laboratory

New York Blue/L is an 18 rack IBM Blue Gene/L massively parallel supercomputer located at Brookhaven National Laboratory (BNL) in Upton, Long Island, New York. It is the centerpiece of the New York Center for Computational Sciences (NYCCS), a cooperative effort between BNL and Stony Brook University that will also involve universities throughout the state of New York. Each of the 18 racks consists of 1024 compute nodes (a total of 18432 nodes) with each node containing two 700 MHz PowerPC 440 core processors and 1 GB of memory (a total of 36864 processors and 18.4 TB of memory).

IBM Printer 1967 by Lawrence Livermore National Laboratory (LLNL)

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The IBM 1401 processor, 1402 card reader and 1403 printer were components of the all-transistorized system. The 1403 line printer, shown here (1967) could print 600 lines of text per minute and could skip blank lines at up to 75 inches/second. Although most commonly used by small businesses, the IBM 1401 was also frequently used at Lawrence Livermore National Laboratory as an off-line peripheral controller for large scientific computers such as the IBM 7090.

Wien, 3. Bezirk (the art of very historic places in the suburbs of Vienna), Arsenal - Heeresgeschichtliches Museum, military history museum, museo de la historia militar, museo della storia militare, musée de l'histoire militaire (Arsenalstraße) by Alfred Lex

Arthur Kaan (1867 - 1940), Imperial and Royal Uhlan propped on sabre, about 1914/15 (reproduction), k. u. k. Ulan auf Säbel gestützt (Nachbildung)

Kaan studied sculpture at the Vienne Academy of Fine Arts. 1896 he became member of the Vienna Künstlerhaus. At the beginning of World War I he was conscripted into the Infantry Regiment No 4 "Hoch- und Deutschmeister. He asked to be admitted into the k. u. k. Kriegspressequartier (KPQ), where he served from July 3. 1917. The Uhlan sculpture on display here as a reproduction was made by him as a reference piece for admission into the KPQ.

Kaan studierte Bildhauerei an der Wiener Akademie der bildenden Künst und wurde 1896 Mitglied des Wiener Künstlerhauses. Zu Beginn des Ersten Weltkrieges wurde er zum Infanterieregiment Nr. 4 "Hoch- und Deutschmeister" eingezogen. Er bat um Aufnahme in das k. u. k. Kriegspressequartier (KPQ), dem er schließlich ab 3. Juli 1917 angehörte. Die hier reproduzierte Ulanenfigur fertigte er jedoch bereits zuvor als Referenzstück für die Aufnahme ins KPQ an.

Arsenal (Vienna)

The Vienna Arsenal, object 1

(Pictures you can see by clicking on the link at the end of page!)

The Arsenal in Vienna is a former military complex in the southeast of the city, located

in the 3rd district of Vienna. The mighty, consisting of several brick buildings facility is located on a rectangular plan on a hill south of the Country Road Belt (Landstraßer Gürtel).