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	Online Encyclopedia and Dictionary - Very Large Telescope
		VLT is located at the Paranal Observatory on Cerro Paranal, a 2,635 m high mountain in the Atacama desert in northern Chile.
		The principle role of the VLT is to operate as four independent telescopes, and the interferometry (combining light from multiple telescopes) is a minor secondary role.
		The VLT is intended to achieve an effective angular resolution of 0.001 arcsecond at a wavelength of 1 µm, comparable to that achieved using other arrays such as the Navy Prototype Optical Interferometer and the CHARA Array.
	www.fact-archive.com /encyclopedia/VLT (634 words)

	Paranal Information
		Very Large Telescope array (VLT) is the flagship facility for European astronomy at the beginning of the third Millennium.
		The VLT instrumentation programme is the most ambitious programme ever conceived for a single observatory.
		Individual telescopes of the VLT observatory can currently work togehter, in groups of two or three, as the ‘VLT Interferometer’ (VLTI), so that they act as a single, giant telescope, as large as the entire group.
	www.eso.org /public/astronomy/teles-instr/paranal.html (601 words)

	Very Large Telescope (VLT)
		The Very Large Telescope Interferometer (VLTI), equivalent to a single instrument with a mirror 16 m in diameter, combines the light from the four big Unit Telescopes and from several moveable 1.8-m Auxiliary Telescopes, spaced across baselines of up to 200 m, by way of the Interferometric Tunnel.
		Inside this 130-m-long underground cavern, the light beams gathered by the telescopes are passed through delay lines to compensate for the slightly different path-lengths they have taken in reaching the instruments.
		This gives the VLT a maximum angular resolution of about 0.001 arc-second at 1 micron wavelength (in the near-infrared), which is equivalent to about 2 meters at the distance of the Moon.
	www.daviddarling.info /encyclopedia/V/VLT.html (378 words)

	Wikipedia: Very Large Telescope
		The VLTI (Very Large Telescope Interferometer) building is the low structure in front of the telescopes (with the fl rectangle in the roof).
		The VLT consists of a cluster four of large telescopes, and an interferometer (VLTI) which will be used to resolve fine features.
		The VLT is intended to achieve an effective angular resolution of 0.001 arcsecond at a wavelength of 1 µm.
	www.factbook.org /wikipedia/en/v/ve/very_large_telescope.html (342 words)

	Telescope - MSN Encarta
		A new technique in optical astronomy is to combine signals from telescopes in separate locations so that the resulting image is equal to that received from one giant telescope, a method called optical interferometry.
		The VLT combines the light from four 323-in (820-cm) telescopes and several smaller telescopes to produce an image equivalent to that of a 630-in (1,600-cm) telescope.
		By simultaneously linking signals from two or more radio telescopes in separate locations, a technique called radio interferometry, astronomers create a huge telescope whose power is equal to a telescope as large in diameter as the separation between the two smaller telescopes.
	encarta.msn.com /encyclopedia_761557777_2/Telescope.html (1160 words)

	Very Large Telescope: Definition and Links by Encyclopedian.com
		The VLT is a project of the European Southern Observatory organization.
		The VLT consists of a cluster four of large telescopes, and an interferometer (VLTI) which will be used to resolve fine features.
		In its full interferometric operating mode, the VLT is intended to achieve an effective angular resolution of 0.001 arcsecond at a wavelength of 1 µm.
	www.encyclopedian.com /vl/VLTI.html (284 words)

	ESO Approves 'Extremely Large Telescope' Study (Site not responding. Last check: 2007-10-27)
		An artist's impression of the European Extremely Large Telescope provides a bird's-eye view of the structure, which features a 42-m diameter primary mirror -- its total rotating mass is 5500 tons -- and two platforms on each side of the structure to hold large instruments.
		The telescope's novel design is based on five mirrors and results in exceptional image quality with no significant aberrations in the field of view.
		VLT is currently the world's largest and most advanced optical telescope, consisting of four 8.2-m reflecting unit telescopes and several moving 1.8-m auxiliary telescopes.
	www.photonics.com /content/news/2006/December/12/85345.aspx (903 words)

	Very Large Telescope - Wikipedia, the free encyclopedia
		The VLT consists of a cluster of four large (8.2 meter diameter) telescopes, and an astronomical interferometer (VLTI) which is used to resolve fine features.
		The VLTs are equipped with a large set of instruments permitting observations to be performed from the near-UV to the mid-IR (ie a large fraction of the light wavelengths accessible from the surface of the Earth), with the full range of techniques including high-resolution spectroscopy, multi-object spectroscopy, imaging, and high-resolution imaging.
		In particular, the VLT has several Adaptive optics systems, which at infrared wavelengths correct for the effects of the atmospheric turbulence, providing images almost as sharp as if the telescope was in space.
	en.wikipedia.org /wiki/Very_Large_Telescope (1305 words)

	Biggest Telescope To Prove US Went To Moon
		In an effort to silence claims that the Apollo Moon landings were faked, European scientists are to use the world's newest and largest telescope to see whether remains of the spacecraft are still on the lunar surface.
		The VLT team hopes to improve on this, with the aim of detecting clear evidence for the presence of the landers.
		Dr Robert Massey, an astronomer at the Royal Greenwich Observatory, said that the conspiracy theorists are unlikely to be deterred by photographic evidence.
	www.rense.com /general32/biga.htm (767 words)

	NRAO Sites and Telescopes
		The Very Large Array (VLA), one of the world's premier astronomical observatories, consists of 27 25-meter radio antennas each weighing approximately 200 tons, in a Y-shaped configuration on the Plains of San Agustin 60 miles west of Socorro, New Mexico.
		The Very Large Array B Array Faint Images of the Radio Sky at Twenty-cm (FIRST) is designed to survey 10,000 square degrees of the north galactic cap.
		The Very Large Array D Array NVSS Survey is a radio continuum survey covering the sky north of -40 degrees declination.
	www.nrao.edu /telescopes (695 words)

	Very Large Telescope Interferometer - Delay Line
		The Very Large Telescope Interferometer (VLTI) Delay Line project is an initiative of the European Southern Observatory (ESO).
		The Telescopes are placed on the top of the 2650 m Cerro Paranal in the centre of the Atacama Desert in Chile.
		The Delay Lines will be used to combine the signal of two or more telescopes simultaneously, thereby creating an image with a resolution of upto 15 times the resolution that can be obtained with a single large telescope.
	www.millhouse.nl /vlt001.html (380 words)

	Re: How does the Very Large Array (Telescope) work?
		The Very Large Array is a radio interferometer located on the Plains of San Agustin, about 150 km southwest of Albuquerque, NM, and is operated by the National Radio Astronomy Observatory for the National Science Foundation.
		The surprising answer is that most of the telescope's mirror can be covered, yet the telescope would retain essentially all of its angular resolution (provided the telescope is covered randomly; if only the outer portions of the mirror are covered, this is equivalent to making the telescope smaller).
		Very Long Baseline Array, the Westerbork Synthesis Radio Telescope, and the Square Kilometer Array.
	www.madsci.org /posts/archives/jul2001/994005901.As.r.html (844 words)

	Telescope - Wikipedia, the free encyclopedia
		Where the telescope is used for direct viewing by the human eye, then very few telescopes are pure reflectors, as it is usual to use an eyepiece to view the image, and most, if not all eyepiece design use an arrangement of lenses.
		The Very Large Telescope array (VLT) is currently (as of 2002) the record holder for total collecting area in an array of telescopes, with four telescopes each 8 meters in diameter.
		The telescope was aimed by the aid of a Foucault sidérostat, which is a movable plane mirror with a 2-meter diameter, mounted in a large cast-iron frame.
	en.wikipedia.org /wiki/Telescopes (2137 words)

	NSO: Astronomy: The Very Large Telescope (VLT) (Site not responding. Last check: 2007-10-27)
		The Very Large Telescope (VLT) is located at the Paranal Observatory in Chile's Atacama desert and is currently the world's largest and most advanced optical telescope.
		With all four telescopes working together, the total light collecting power is equivalent to a 16 metre single telescope - thus making the VLT the largest optical telescope in the world.
		This image shows the superb quality of the VLT in capturing so much detail on a galaxy that is well over 100 million light years away.
	www.schoolsobservatory.org.uk /astro/textb/tele/world/vlt.htm (363 words)

	Parachi 2003 - VERY LARGE TELESCOPE
		VLT will be soon the largest telescope ever built in the world.
		It is composed from four telescopes with mirrors made from one segment, each of 8.2 meters in diameter.
		The telescopes are built at the most dry place on the Earth, at the Atacama desert (Chile), at the altitude 2 600 m above sea level.
	www.aldebaran.cz /actions/2003_parachi/vlt_en.html (683 words)

	Celebrating 5 years of the Very Large Telescope
		The VLT Interferometry has already shown to be a very efficient tool to measure the diameter of very small star or to perform the first interferometry of an extragalactic object.
		The ESO Very Large Telescope (VLT) at the Paranal Observatory (Atacama, Chile) is the world's largest and most advanced optical telescope.
		In joining ESO, UK astronomers have gained access to the four 8.2-metre telescopes that comprise the Very Large Telescope (VLT) and to the several 1.8-metre telescopes that make up the Very Large Telescope Interferometer (VLTI); These facilities are located in the northern part of the Atacama desert in Chile.
	www.pparc.ac.uk /Nw/VLT5.asp (1109 words)

	ESO - Telescopes and Instrumentation
		All four unit telescopes of 8.2m diameter are individually in operation with a large collection of instruments.
		In addition to the 8.2m diamter telescopes the VLTI is complemented with four Auxiliary Telescopes (AT) of 1.8m diameter to improve its imaging capabilities and enable full nighttime use on a year-round basis.
		Two telescopes for imaging surveys are also under construction for Paranal, the VLT Survey Telescope (VST, 2.6m diameter) for the visible, and the Visible and Infrared Survey Telescope for Astronomy (VISTA, 4m).
	www.eso.org /public/astronomy/teles-instr (372 words)

	esm_chaisson_BG4\|Telescopes: The Tools of Astronomy\|Images
		These are very different than the famous gamma-ray burst sources, because the gamma rays shine continuously instead of coming in a flash, like the gamma-ray bursts." The discovery of this new class and speculation regarding its qualities appear in the March 22 issue of Nature in an article by Drs.
		Each telescope will be equipped with a camera like this one that will house 3 near-infrared arrays, so that the sky can be surveyed simultaneously at wavelengths in the J band (1.25 microns), H band (1.65 microns) and Ks band (2.16 microns).
		The Very Large Array (VLA) consists of 27 antennas arranged in a Y-shaped pattern that can be expanded on rails to be up to 36km across -- roughly one and a half times the size of Washington, DC.
	wps.prenhall.com /chaisson_BG4/0,7633,695590-,00.html (3008 words)

	Physics News Update Number 13 - THE VERY LARGE TELESCOPE (VLT) (Site not responding. Last check: 2007-10-27)
		The VLT will consist of four 8.2-m telescopes, the first of which should be installed by 1995; the equivalent 16-m diameter of the composite device will be much larger than the 10-m Keck or 6-m Hale telescopes.
		The seeing conditions for VLT, already very good because of the high elevation in the Andean mountains, will be improved by the use of adaptive optics.
		The resultant optimal resolution for the telescope may be as good as 0.0005 arcseconds.
	www.aip.org /pnu/1990/split/pnu013-3.htm (110 words)

	Very Large Telescope Interferometer (VLTI)
		The European Southern Observatory's (ESO's) Very Large Telescope (VLT) has interferometric tunnels connecting the four 8.2-m telescopes with each other via their so-called Coude foci.
		The mountain top was blasted away to have such a flat surface, under which tunnels are located for transporting the light beams from each telescope to the delay units and from there on to the detectors.
		Delay lines are devices that delay the signal coming from one telescope with respect to that of another so as to make both signals arrive at the detector simultaneously.
	www.atnf.csiro.au /people/mdahlem/obs/opt/vlti.html (369 words)

	An Automatic washing machine to remove aluminum from a Very Large telescope
		In this telescope the light beam coming from the two mirrors can be either combined to feed a central instrument, or can feed two independent Gregorian foci and the data combined with a computer.
		Removing the mirror from the optical support structure would be a very risky operation (this is likely to be a common problem for all very large lightweight mirrors).
		For the aluminizing operations the telescope is pointed to the horizon, holding the mirror in vertical position.
	lbtwww.arcetri.astro.it /tech/oab9702.htm (1738 words)

	SPACE.com -- Astronomers Rejoice at Chilean Telescope's First Light
		Very Large Telescope (VLT) achieved "first light" by snapping its first image of a distant stellar gas cloud located 6,000 to 8,000 light-years away from Earth.
		With the addition of the Yepun telescope, the VLT becomes one of the largest optical telescope in the world.
		The VLT telescopes currently work primarily in the optical range of the electromagnetic spectrum the same general range employed by the Hubble Space Telescope.
	www.space.com /scienceastronomy/astronomy/vlt_fourth_light_000908.html (483 words)

	Astrobiology Magazine - beginning study of life - Origin - evolution - life beyond Earth - Universe
		With the VISIR instrument on ESO's Very Large Telescope, astronomers have mapped the disc around a star more massive than the Sun.
		The astronomers used the VISIR instrument on ESO's Very Large Telescope to map in the infrared the disc surrounding the young star HD 97048.
		They discovered a very large disc, at least 12 times more extended than the orbit of the farthest planet in the Solar System, Neptune.
	www.astrobio.net /news/print.php?sid=2102 (636 words)

	VLTI first fringes with two auxiliary telescopes at Paranal
		Contrary to other large astronomical telescopes, the VLT was designed from the beginning with the use of interferometry as a major goal.
		As the achievable image sharpness increases with telescope separation, interferometric observations with the ATs positioned at the extreme positions will therefore yield sharper images than is possible by combining light from the large telescopes alone.
		The VLT Interferometer will, for example, allow astronomers to study details on the surface of stars or to probe proto-planetary discs and other objects for which ultra-high precision imaging is required.
	www.eurekalert.org /pub_releases/2005-03/eso-vff031005.php (1309 words)

	ESO's Very Large Telescope (Site not responding. Last check: 2007-10-27)
		The VLT control building is on the smaller and slightly lower platform to the lower left.
		Wide-angle photo of the second 8.2-m VLT Unit Telescope, KUEYEN, obtained on March 10, 1999, with the main mirror and its cell in place at the bottom of the telescope structure.
		The Paranal Inauguration on March 5, 1999, took place under this telescope that was tilted towards the horizon to accommodate nearly 300 persons on the observing floor.
	www.cosmiclight.com /imagegalleries/vlt.htm (349 words)

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