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LHC_Homepage. The Large Hadron Collider (LHC) is the world’s largest and most powerful particle accelerator. It first started up on 10 September 2008, and remains the latest addition to CERN’s accelerator complex. The LHC consists of a 27-kilometre ring of superconducting magnets with a number of accelerating structures to boost the energy of the particles along the way. Inside the accelerator, two high-energy particle beams travel at close to the speed of light before they are made to collide. The beams travel in opposite directions in separate beam pipes – two tubes kept at ultrahigh vacuum. Thousands of magnets of different varieties and sizes are used to direct the beams around the accelerator.

All the controls for the accelerator, its services and technical infrastructure are housed under one roof at the CERN Control Centre. Home | CTIO. Mauna Kea Observatories. The 4,200 meter high summit of Mauna Kea in Hawaii houses the world's largest observatory for optical, infrared, and submillimeter astronomy. Move your mouse over a dome to identify a telescope Click on the dome to go to its website Subaru Telescope 8.3-meter diameter optical/IR telescope operated by Japan Subaru website UH Hilo Educational telescope The first telescope on the mountain, a 0.6m diameter reflector, was placed on this site in 1969. UH-Hilo Educational Telescope website Gemini Telescope An 8.1-meter optical/IR telescope operated by a consortium of seven countries. Gemini Telescope website Submillimeter Array Eight 6-meter submillimeter antennas operated by Smithsonian Astrophysical Observatory and Taiwan SMA website James Clerk Maxwell Telescope 15-meter diameter telescope for submillimeter astronomy operated by the UK, Netherlands and Canada JCMT website Canada-France-Hawaii Telescope 3.6-meter optical telescope operated by Canada, France, and Hawaii CFHT website IRTF website W.

Keck website. LHC. Le LHC, l’accélérateur de particules le plus grand et le plus puissant du monde, est le dernier maillon du complexe d’accélérateurs du CERN. Il consiste en un anneau de 27 kilomètres de circonférence formé d’aimants supraconducteurs et de structures accélératrices qui augmentent l’énergie des particules qui y circulent. À l’intérieur de l’accélérateur, deux faisceaux de particules circulent à des énergies très élevées et à une vitesse proche de celle de la lumière avant de rentrer en collision l’un avec l’autre. Les faisceaux circulent en sens opposé, dans des tubes distincts placés sous un vide très poussé (ultravide). Ils sont guidés le long de l’anneau de l’accélérateur par un puissant champ magnétique, généré par des électroaimants supraconducteurs.

Ces derniers sont composés de bobines d’un câble électrique spécial fonctionnant à l'état supraconducteur, c’est-à-dire conduisant l’électricité sans résistance ni perte d’énergie. Kitt Peak National Observatory. Image Credit: Dean Ketelsen This image was taken in mid December 2013 from the Mount Lemmon Highway by Dean Ketelsen. Dean and a group of amateur astronomers make it an annual event to trek up the highway to observe the sunset alignment of Kitt Peak National Observatory. Vist Dean's blog at to read more on this spectacular image and event. Kitt Peak National Observatory (KPNO), part of the National Optical Astronomy Observatory (NOAO), supports the most diverse collection of astronomical observatories on Earth for nighttime optical and infrared astronomy and daytime study of the Sun.

Sharing the mountaintop site with the National Solar Observatory, KPNO, founded in 1958, operates three major nighttime telescopes and hosts the facilities of consortia which operate 22 optical telescopes and two radio telescopes. Previous homepage images. NASA - Home.