371 résultats pour "spaces"

• Space Shuttle - astronomy.

  The two SRBs, with their combined thrust of some 26 million newtons (about 5.8 million lb), provide most of the power for the first two minutes of flight. The SRBs takethe space shuttle to an altitude of 45 km (28 mi) and a speed of 4,973 km/h (3,094 mph) before they separate and fall back into the ocean to be retrieved,refurbished, and prepared for another flight. After the boosters fall away, the three main engines continue to provide thrust. These engines are clustered at the rear end of the...

• Space Exploration - astronomy.

  to produce 250,000 newtons (56,000 lb) of thrust. The Germans launched thousands of V-2s carrying explosives against targets in Britain and The Netherlands. Whilethey did not prove to be an effective weapon, V-2s did become the first human-made objects to reach altitudes above 80 km (50 mi)—the height at which outer spaceis considered to begin—before falling back to Earth. The V-2 inaugurated the era of modern rocketry. A2 Early Artificial Satellites During the years following World War II, the...

• THE SCALE OF SPACE

  our journey into space - it is far too slow. We must ride in a super spaceship that can travel at the highest speed possible. This is the speed of light. Light travels at a speed of about 300,000 km a second, or 1,080 million km an hour. Science fiction stories and films feature starships propelled by photon rockets, which achieve the speed of light by beaming intense light rays from their engines. The 'Star Trek' adventure series features the best known of these, the starship Enterprise. NASA...

• Space Telescope - astronomy.

  of its normal companion star and heating it to millions of degrees. See also X-Ray Astronomy; Chandra X-Ray Observatory. D2 Gamma-Ray Space Observatories Studying gamma rays offers scientists answers to some of the most perplexing questions about the explosive and dynamic physical processes in the universe. Gamma-ray observation also provides clues about the structure and dynamics of the Milky Way and other galaxies; the nature of pulsars, quasars, black holes, and neutronstars; and the orig...

• spaces and exchanges

  Span ish and Mexican i m m ig ran ts w ho sett led there. F rom a geograph ica l poin t of v iew, we can rema rk t ha t t here a re often d i f ferent neighborhoods w i t h a specif ic ethn ic or ig i n, such as t he many Ch i na towns a l l over Amer ica. Such neighborhoods h igh l igh t t he d iversi ty of t he cu l t u res t ha t compose t he A mer ican “ mel t i ng pot”. So t he mu l t i-cu l t u r a l aspect of Amer ica def i n i tely dea ls w i t h both space an d exchanges...

• 2001: A Space Odyssey 2001: A Space Odyssey, science-fiction motion picture about extraterrestrial life, human evolution, and technology, directed by Stanley Kubrick and released in 1968.

• I am going to talk about the notion “spaces and exchanges”.

  a documentary about “The Wall”. The Wall is the Mexico - United States barrier. Americans have built the Wall in order to prevent immigrants from crossing the border. The “Wall” is at the centre of a controversy, in fact some people are against it because they think that it is very expensive and ineffective. It jeopardizes the immigrants' health and safety and moreover it damages the environment. But the major part of Americans is for because they think it prevents illegal immigrants from enteri...

• Canadian Space Agency.

• Spaces and exchanges

• Space Station - astronomy.

• Spaces and Exchanges - Asian immigration in America

  helps, support itself. In this community there is a real importance of the family and of the education. in fact they are also highly -educated. This immigration is very successful because the parents push their children to be excellent, force them to have good grades, pressurize them into succeeding, punish them into working even pay them into working. Nonetheless, t he immigration is not success for all. Indeed, the community, is not a lways well accepted like we see in the song " Ga...

• European Space Agency - astronomy.

• Luna (space program) - astronomy.

• National Air and Space Museum.

• Phobos (space program) - astronomy.

• Mars (space program) - astronomy.

• Hubble Space Telescope (HST) - astronomy.

• Infrared Space Observatory - astronomy.

  know how often these disks occur around stars to help them understand how common it is for planets to form. ISO found several previously unknown stars with disks.ISO also detected olivine, a silicate mineral found in Earth’s own rocky mantle, in the comet Hale-Bopp, which was visible from Earth in 1996 and 1997. The discovery ofolivine in the comet suggests that the comet and Earth have a similar origin. The satellite also detected the first evidence of water outside of the solar system inplanet...

• Spaces and exchanges

• Vega (space program) - astronomy.

• Spaces and exchanges (anglais terminale)

  In conclusion, I thing that it’s important to remember that these places and exchanges in English speaking countries are first based on the American dream which is changing in today’s modern days. The hope to live a better life had motive a lot of immigrants. But today, the life of immigrants is not always easy , because they always live in the fear and they always remember their roots. But after all, United States are today a multicultural society and a country very developed which i...

• Spaces and Exchanges

• SPACE: THE BEGINNING AND THE END

  2.The Big Bang Astronomers reckon that 15,000 million years ago all the matter, and energy, in the universe was created, and the universe started to expand, in a gigantic explosion they call the Big Bang. The Big Bang didn't just create matter and energy. It created space as well. It also created time. There was no matter, energy, space or time until the Big Bang. We can't talk about 'before the Big Bang', because time didn't exist until the Big Bang. At the instant of the Big Bang, the univ...

• National Aeronautics and Space Administration [NASA] - astronomie.

• Infrared Space Observatory [ISO] - astronomie.

  la vie de l’étoile. L’imagerie et la spectroscopie infrarouge permettent de sonder ces milieux et d’en déterminer l’exacte composition chimique, ainsi que la structure. Parmi les découvertes marquantes d’ISO figure la détection de la présence d’olivine dans la comète de Hale-Bopp visible de la Terre en 1996 et 1997. Ce minéral à base desilicates est contenu également dans le manteau rocheux de la Terre, ce qui confirme l’origine commune de ces deux corps. Par ailleurs, ISO a détecté pour la prem...

• EADS [European Aeronautic Defence and Space Company] (entreprise).

• NASA - astronomy.

  Challenger shuttle after launch in 1986 and the Columbia shuttle during reentry in 2003, killing both crews. Investigations traced the accidents to design flaws and tomanagement problems. Both accidents led to design and procedure changes, and to a temporary stoppage of shuttle flights. Following the Columbia disaster, NASA alsoannounced plans to retire the shuttle in 2010, after completion of the International Space Station (ISS), a human orbital research facility. The Constellation program is...

• Astronaut - astronomy.

  Every operation during a flight is important and interesting, but many might be boring to an observer. Much of an astronaut’s job is entering computer instructions,preparing samples, making measurements, recording data, fixing what breaks, and adjusting the checklist when something unexpected happens. Sometimes astronautsretrieve or repair satellites, rendezvous or dock with other spacecraft, and do important emergency repairs. The adaptability of the human crew is crucial to the successof missi...

• Kennedy Space Center.

• Aerospace Medicine - astronomy.

  medically as aeroembolism and popularly as the bends, leads to confusion, paralysis, or neurocirculatory collapse. The most characteristic symptoms of the bends arepain in the large joints resulting from pressure of the gas on tendons and nerves, together with spasm of the blood vessels. Preflight inhalation of pure oxygen toeliminate nitrogen from the system has proved valuable as a preventive measure. Rapid decompression, resulting from accidental failure at high altitudes of thepressure withi...

• Artificial Satellite - astronomy.

  The first stage of a multistage rocket consists of rocket engines that provide a huge amount of force, or thrust. The first stage lifts the entire launch vehicle—with itsload of fuel, the rocket body, and the satellite—off the launch pad and into the first part of the flight. After its engines use all their fuel, the first stage portion of therocket separates from the rest of the launch vehicle and falls to Earth. The second stage then ignites, providing the energy necessary to lift the satellit...

• Relativity I INTRODUCTION Albert Einstein In 1905 German-born American physicist Albert Einstein published his first paper outlining the theory of relativity.

  in calculating very large distances or very large aggregations of matter. As the quantum theory applies to the very small, so the relativity theory applies to the verylarge. Until 1887 no flaw had appeared in the rapidly developing body of classical physics. In that year, the Michelson-Morley experiment, named after the American physicistAlbert Michelson and the American chemist Edward Williams Morley, was performed. It was an attempt to determine the rate of the motion of the earth through t...

• AXE ANGLAIS BAC

  libraries are public space. Although not considered public space, privately owned buildings or property visible from sidewalks and public thoroughfares may affect the public visual landscape, for example, by outdoor advertising.  ___  Private space is the region surrounding a person which they regard as psychologically theirs. Most people value their personal space and feel discomfort, anger, or anxiety when their personal space is encroached.Permitting a person to enter personal s...

• Relativity - astronomy.

  beta, for example, might be as large as 0.5, and the mass of the electron doubled. The mass of a rapidly moving electron could be easily determined by measuring thecurvature produced in its path by a magnetic field; the heavier the electron, the greater its inertia and the less the curvature produced by a given strength of field ( see Magnetism). Experimentation dramatically confirmed Einstein's prediction; the electron increased in mass by exactly the amount he predicted. Thus, the kinetic ener...

• Astronomy - astronomy.

  Telescopes may use either lenses or mirrors to gather visible light, permitting direct observation or photographic recording of distant objects. Those that use lenses arecalled refracting telescopes, since they use the property of refraction, or bending, of light ( see Optics: Reflection and Refraction ). The largest refracting telescope is the 40-in (1-m) telescope at the Yerkes Observatory in Williams Bay, Wisconsin, founded in the late 19th century. Lenses bend different colors of light by d...

• Rocket.

  the vacuum of space, however, demonstrated that this belief was not true. In fact, rockets produce more thrust in the vacuum of space than on Earth. Air pressure andfriction with the air reduce a rocket’s thrust by about 10 percent on Earth as compared to the rocket’s performance in space. B Thrust and Efficiency Thrust is a measurement of the force of a rocket, or the amount of “push” exerted backward to move a rocket forward. Thrusts vary greatly from rocket to rocket.Engineers measure thrust...

• Rocket - astronomy.

  the vacuum of space, however, demonstrated that this belief was not true. In fact, rockets produce more thrust in the vacuum of space than on Earth. Air pressure andfriction with the air reduce a rocket’s thrust by about 10 percent on Earth as compared to the rocket’s performance in space. B Thrust and Efficiency Thrust is a measurement of the force of a rocket, or the amount of “push” exerted backward to move a rocket forward. Thrusts vary greatly from rocket to rocket.Engineers measure thrust...

• Astrobiology - astronomy.

  water to help reactions along. American chemists Stanley Miller and Harold Urey tested part of Oparin and Haldane’s hypothesis in the early 1950s by simulating conditions of the early Earth. In whathas become known as the Miller-Urey experiment, the two scientists connected two flasks with a loop of glass tubing that allowed the gases to pass between the flasks.They filled the upper flask with methane, ammonia, and hydrogen—components thought to have been in the early atmosphere. They filled the...

• Infrared Astronomy - astronomy.

  ft above sea level. With the launch of the Infrared Astronomical Satellite (IRAS), by the United States, the United Kingdom, and The Netherlands in 1983, infraredastronomy took another leap forward. This mission surveyed the entire sky at wavelengths of 12, 25, 60, and 100 microns (1 micron is a millionth of a meter) until itsonboard supply of liquid helium ran out. A short time later infrared astronomy was revolutionized by the first introduction of devices that could take infrared images. Thea...

• Mercury (planet) - astronomy.

  In 1991 powerful radio telescopes on Earth revealed signs of possible deposits of ice in the polar regions of Mercury. These ice deposits occur in areas where sunlightnever falls, such as crater bottoms near both of the planet’s poles. Similar ice deposits may have been found during the 1990s near the poles of the Moon by theClementine and Lunar Prospector spacecrafts. The ice on Mercury likely comes from comets or water-bearing meteorites that have hit Mercury over the planet’s historyup throug...

• Comet - astronomy.

  may exceed the planet Jupiter in size, however. Observations from telescopes on Earth and in space indicate that most of the gases in the coma and tail of a comet are fragmentary molecules, or radicals, of the mostcommon elements in space: hydrogen, carbon, nitrogen, and oxygen. The radicals, for example, of CH, NH, and OH may be broken away from the stable molecules CH 4 (methane), NH 3 (ammonia), and H 2O (water), which may exist as ices or more complex, very cold compounds in the nucleus. Al...

• Asteroid - astronomy.

  Asteroids of the S type, related to the stony iron meteorites, make up about 15 percent of the total population of asteroids that can be seen from Earth. Much rarer arethe M-type objects, corresponding in composition to the meteorites known as “irons.” These objects are made up of an iron-nickel alloy and may represent the cores ofbodies that were large enough to differentiate into layers and to melt deep inside. Their rocky outer layers may have been removed by impacts with other asteroids . A...

• Matrix Theory and Linear Algebra I INTRODUCTION Matrix Theory and Linear Algebra, interconnected branches of mathematics that serve as fundamental tools in pure and applied mathematics and are becoming increasingly important in the physical, biological, and social sciences.

  vectors and V is called a vector space of dimension m. Two- and three-dimensional Euclidean spaces are vector spaces when their points are regarded as specified by ordered pairs or triples of real numbers. Matrices may be used to describe linear changes from one vector space into another. Contributed By:James Singer Reviewed By:J. Lennart BerggrenMicrosoft ® Encarta ® 2009. © 1993-2008 Microsoft Corporation. All rights reserved.

• Smithsonian Institution.

  F Arthur M. Sackler Gallery The Arthur M. Sackler Gallery houses a permanent collection of art from China, South and Southeast Asia, ancient and Islamic Iran, and Japan. Changing exhibitions ofAsian art are drawn from collections in the United States and abroad. The core of the collection was a gift from American research physician and medical publisherArthur M. Sackler. G Cooper-Hewitt, National Design Museum The Cooper-Hewitt is located in New York City and features examples of historical an...

• Extrasolar Planets - astronomy.

  When a planet passes in a front of the star it orbits—an event called a transit—it causes a small dip in the brightness of the star. Measuring the slight change in thebrightness can be used not only to directly detect a planet, but to determine its size and orbit. However, the planet needs to orbit in a plane that lies in a telescope’sline of sight on the star. Despite long odds, Earth-based telescopes have detected and studied a few exoplanets using this method. The first space telescope design...

• Uranus (planet) - astronomy.

  V COMPOSITION AND STRUCTURE A Interior of Uranus Uranus contains mostly rock and water, with hydrogen and helium (and trace amounts of methane) in its dense atmosphere. Astronomers believe that Uranus, likeNeptune, formed from the same material—principally frozen water and rock—that composes most of the planet’s moons. As the planet grew, pressures andtemperatures in the planet’s interior increased, heating the planet’s frozen water into a hot liquid. Uranus probably has a relatively small roc...

• Neptune (planet) - astronomy.

  The gaseous atmosphere of Neptune contains hydrogen, helium, and about 3 percent methane. It extends about 5,000 km (about 3,000 mi) above the planet’s ocean.Light reflected from Neptune’s deep atmosphere is blue, because the atmospheric methane absorbs red and orange light but scatters blue light. In 1998 astronomersalso identified molecules of methyl in Neptune’s atmosphere. Methyl molecules each contain one carbon atom and three hydrogen atoms. Methyl molecules are knownas hydrocarbon radical...

• Geographic Exploration.

  The commercial reason for exploration has been a consistent driving force. In 1492 the great navigator Christopher Columbus sailed west across the Atlantic Oceanseeking a new, shorter, and cheaper route to reach the riches of East Asia, and Portuguese explorer Vasco da Gama circumnavigated Africa for much the same reason.Yet similar investigations of the profitable eastern trade had already been made by Arab sailors. Arab trading ships were sailing from the Arabian Sea to southeasternAsia probab...

• Geographic Exploration - explorer.

  The commercial reason for exploration has been a consistent driving force. In 1492 the great navigator Christopher Columbus sailed west across the Atlantic Oceanseeking a new, shorter, and cheaper route to reach the riches of East Asia, and Portuguese explorer Vasco da Gama circumnavigated Africa for much the same reason.Yet similar investigations of the profitable eastern trade had already been made by Arab sailors. Arab trading ships were sailing from the Arabian Sea to southeasternAsia probab...

• ESA (European Space Agency).