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Topic: Telescope

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  Telescope - Wikipedia, the free encyclopedia
Telescopes work by employing one or more curved optical elements - lenses or mirrors - to gather light or other electromagnetic radiation and bring that light or radiation to a focus, where the image can be observed, photographed or studied.
Newtonian or reflecting telescopes employ the reflective properties of light, using a concave paraboic primary mirror to collect and focus incoming light onto a flat secondary (diagonal) mirror that in turn reflects the image through an opening at the side of the main tube and into the eyepiece.
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/Telescope   (2026 words)

 Optical telescope - Wikipedia, the free encyclopedia
An optical telescope is a telescope which is used to gather, and focus light, for directly viewing a magnified image, making a photograph, etc. The term is used especially for a monocular with static mounting for observing the sky.
The f-ratio of a telescope is the ratio between the focal length and the aperture (i.e., diameter) of the objective.
Wide-field telescopes are used to track satellites and asteroids, for cosmic-ray research, and for surveys of the sky.
en.wikipedia.org /wiki/Optical_telescope   (1031 words)

 telescope - HighBeam Encyclopedia
In a reflecting telescope, or reflector, light is reflected by a concave mirror and brought to a focus in front of the mirror.
The angle in radians determined by the object is given by the ratio of the object's diameter to its distance from the telescope.
Equal in importance to the mirrors and lenses constituting the optics of a telescope is the mounting of the telescope.
www.encyclopedia.com /html/t/telescop.asp   (1936 words)

 telescope - HighBeam Encyclopedia
TELESCOPE [telescope] traditionally, a system of lenses, mirrors, or both, used to gather light from a distant object and form an image of it.
Traditional optical telescopes, which are the subject of this article, also are used to magnify objects on earth and in astronomy; other types of astronomical telescopes gather radio waves (see radio astronomy), X rays (see X-ray astronomy), or infrared or ultraviolet radiation.
The signals from two or more smaller telescopes at separate locations are combined so that the resulting image is equal to that which would be received from a very large telescope, or virtual telescope.
www.encyclopedia.com /html/t1/telescop.asp   (1922 words)

 Galileo's Telescope   (Site not responding. Last check: 2007-10-22)
With the acceptance of the astronomical telescope, the limit on magnification caused by the small field of view of the Galilean telescope was temporarily lifted, and a "telescope race" developed.
Because of optical defects, the curvature of lenses had to be minimized, and therefore (since the magnification of a simple telescope is given roughly by the ratio of the focal lengths of the objective and ocular) increased magnification had to be achieved by increasing the focal length of the objective.
From the typical Galilean telescope of 5 or 6 feet in length, astronomical telescopes rose to lengths of 15 or 20 feet by the middle of the century.
cnx.org /content/m11932/latest   (2647 words)

 Meade Instruments Corporation - How Telescopes Work
In the 2" telescope Jupiter's largest cloud belts are clearly observable; but in the 4" telescope the same cloud belts are seen to take on added structure and color, and smaller cloud belts are now visible that could not be discerned in the smaller instrument.
With the telescope's primary optics (objective lens, primary mirror, or a combination of lenses and mirrors) having formed an image at the telescope's focus, the purpose of the eyepiece (consisting of two or more small lenses mounted in a metal barrel) is to magnify this image.
Telescopes are said to be of high-resolution if they are manufactured to optical standards that permit a level of visible detail consistent with the aperture and optical design of the instrument.
www.meade.com /support/telewrk.html   (1750 words)

 The Galileo Project | Science | Telescope
As early as 1611, in his Dioptrice, Johannes Kepler had shown that a telescope could also be made by combining a convex objective and a convex ocular.
[5]The Galilean telescope produces an erect image of an object viewed directly but an inverted image of a projected object; by substituting a convex for the concave ocular, this situation is reversed.
The entire problem of the invention of the telescope is discussed in Albert van Helden, The Invention of the Telescope, in Transactions of the American Philosophical Society, 67, no. 4 (1977).
galileo.rice.edu /sci/instruments/telescope.html   (2709 words)

Unfortunately the telescopes built on Lippershey's model had poor image quality, caused by the bending of light though the glass lenses.
The dish is the same shape as the mirror of a reflecting telescope.
Radio telescopes are a valuable tool for astronomers since many objects in the universe do not produce enough visible light to be picked up by optical telescopes.
www.yesmag.bc.ca /how_work/telescope.html   (1130 words)

 It takes more than one kind of telescope to see the light   (Site not responding. Last check: 2007-10-22)
Although the first telescope was created 400 years ago, we didn't have a complete picture of the electromagnetic spectrum until the early part of this century.
The magnification of Galileo's telescope could only be improved by focusing the light farther behind the primary lens, which resulted in longer and longer telescopes.
Because specialized telescopes are so well developed and are still strongly supported by scientists, the most logical approach would be to coordinate the telescopes already in existence.
science.nasa.gov /newhome/headlines/features/ast20apr99_1.htm   (2687 words)

 The Hubble Space Telescope [encyclopedia]   (Site not responding. Last check: 2007-10-22)
The Hubble Space Telescope - a joint ESA/NASA project - is a 2.4-meter reflecting telescope which was deployed in low-Earth orbit (600 kilometers) by the crew of the space shuttle Discovery (STS-31) on 25 April 1990.
Extending from the telescope are solar panels for generating electricity and antennas for communicating with operators on the ground.
To accomplish this mission, the telescope must battle such celestial elements as air drag, the sun’s radiation, and the gravitational pull of objects.
www.kosmoi.com /Space/HST   (855 words)

 Telescope   (Site not responding. Last check: 2007-10-22)
For our example Telescope, it is best not to exceed 100 to 150 power or approximately 40 to 60 times the inch size of the Objective Lens, which is 2.4 inches (60mm) in our example.
If your telescope has an Equatorial Mount, it is likely that it came with a long coiled adjustment knobs which cause the whole telescope to shake.
When the Telescope is ready to use, it is easier to reconnect the tray to two legs then to retrieve it from where ever it was stored and reconnect it to all 3 legs.
www.synrgistic.com /telguide/begindeptstore.htm   (3081 words)

 Telescope Information
The two 8.4 meter (331 inch) diameter primary mirrors are mounted with a 14.4 meter center-center separation.
By using swing arms to rotate the secondary mirrors and their supports, it is possible to switch the telescope from one mode of observation to another very quickly.
The short focal length of the primary mirrors (F/1.142) permits a compact, and therefore quite stiff telescope structure.
medusa.as.arizona.edu /lbto/telescop.html   (226 words)

 telescope, bushnell telescope. Learn about galileo telescope
Telescopes come in all shapes and sizes, from a little plastic tube you buy at a toy store for $2, to the Hubble Space Telescope weighing several tons.
Amateur telescopes fit somewhere in between, and even though they are not nearly as powerful as the Hubble, they can do some incredible things.
Again, the basic idea is to collect lots of light to form a bright image inside the telescope, and then use something like a magnifying glass to magnify (enlarge) that bright image so that it takes up a lot of space on your retina.
vpmt.com /telescope.htm   (450 words)

One thing considered while designing the telescope was that a heavy cage with a lot of Kydex surface area, located way out at the end of the telescope, would translate into a lot of leverage and thus vibration and longer dampening times should a wind come up or the telescope get bumped.
Further, never mind the inconvenience of owning a heavy telescope, consider that a large profile, heavy telescope with a tall mirror box, must be designed to not only carry the optics of the telescope, but it must also support its own weight.
The 18 inch telescope, with pads in place, was placed on an outdoor carpet as is customary.
www.synrgistic.com /astro/building.htm   (2525 words)

 Spitzer Technology: Telescope
Beryllium is a very strong material which works well in the construction of infrared space telescopes because it has a low heat capacity at very low temperatures.
The telescope is attached to the top of the vapor-cooled cryostat vacuum shell, which keeps the science instruments very cold.
Build the entire telescope of the same material to prevent thermal expansion mismatch complications, and to make the telescope assembly as dimensionally stable as possible.
www.spitzer.caltech.edu /technology/telescope.shtml   (232 words)

 SPACE.com -- Telescope Buying Tips
A 2.4-inch refracting telescope, for example, should never use more than 120-power (the rule of thumb is 50-power per inch of aperture).
A telescope can have the finest optics in the world, yet can be rendered totally useless if the mount is so poor that the image can’t be held in place.
Some might think that binoculars are a bit of a come down from a telescope, but the fact is that for certain aspects of sky watching they are the best instrument.
www.space.com /spacewatch/041126_telescope_tips.html   (1082 words)

 How to Build a Telescope
With the first telescope you built, images were inverted, and in the section "From Lenses to Optical Instruments" I explained why.
The magnification of the telescope (M) is given by the ratio between the objective and eyepiece focal lengths: M = F
With the telescope, you can appreciate that the birds flying in your garden are not all sparrows, but also titmice, robins, finches, flcaps, etc. With your telescope, you will be able to recognize the various species by their colored plumage.
www.funsci.com /fun3_en/tele/tele.htm   (2393 words)

 The Bradford Robotic Telescope   (Site not responding. Last check: 2007-10-22)
The telescope is focused on space and astronomy access for all.
It has its own research programme into galaxies, supernovae and fl holes but it will let you track the astronaut landings on the Moon with images to navigate around its mountains and craters.
The number of reviews and articles on the telescope are starting to grow and so we thought it would be nice to share some with you.
www.telescope.org   (796 words)

 SPACE.com: Telescopes, Telescope, Meade Telescopes
The telescope was one of the very first tools ever used to study outer space, beginning the early and complicated classification of the planets, the Sun, the stars and beyond.
An optical telescope, which is the most common, can then be separated into three types; the Galilean refracting telescope, the Newtonian reflecting telescope, and the Catadioptrics telescope.
The optical telescope works by utilizing one or more curved optical lenses or mirrors to gather light and electromagnetic radiation, then bringing that light or radiation into focus, making objects that are actually great distances away appear to be much closer.
www.space.com /telescope   (342 words)

 Telescope Casual Furniture - Casual, Outdoor, Patio, Pool, Garden Furniture & Chairs, Granville, NY.   (Site not responding. Last check: 2007-10-22)
Telescope Casual Furniture - Casual, Outdoor, Patio, Pool, Garden Furniture & Chairs, Granville, NY.
Telescope Casual Furniture, 100 years of designing and creating the best in wooden and aluminum furniture.
Casual furniture is outdoor, patio, bar stools, commercial chairs, dining, director, chase lounges, contract aluminum wood furniture, wooden folding all-weather marine garden, occasional pieces, planters, powder coat, cushion, sling, strap furniture, tables, umbrellas, serving carts, table, rocking chair, stool, all weather cartes, and we ship world wide through our dealers.
www.telescopecasual.com   (122 words)

 Telescope · Astrological defintion of Telescope · Astrology Encyclopedia
Telescope · Astrological defintion of Telescope · Astrology Encyclopedia · September 1, 2006, 27:26 GMT
The earliest known reflecting telescope was that perfected by James Gregory of Edinborough in 1663.
Tables of Houses · T-cross · Taurus · Telepathy · Telescope · Temporal Houses · The Terminal Houses · Terms of the planets · Testimony · Tetrabiblios · Tetractys - ten symbolic dots · Tetragon · Thema Coeli · Throne · Time · Time.
astrologyweekly.com /dictionary/telescope.php   (660 words)

 Galileo's Telescope   (Site not responding. Last check: 2007-10-22)
The diagram of the optical principles of the telescope from Sidereus Nuncius.
The story of Galileo's telescope is well known, as he recounted it himself in the Starry Messenger.
Galileo continued his observations with his telescope, some of which he conveyed in ciphers to Johannes Kepler, who had already responded enthusiastically with the Conversation with Galileo's Sidereal Messenger.
www.hps.cam.ac.uk /starry/galtele.html   (417 words)

 Advanced Telescope Systems, Telescope Pier Manufacturer, Portable and Permanent Telescope Piers
Piers manufactured by Advanced Telescope Systems are designed for portability and yet maintain the rigidity required for a quality observing experience.
Advanced Telescope Systems portable telescope piers meet the exacting requirement of a rigid base for your observing platform while being very portable, extremely solid, easily leveled and impervious to all weather.
Advanced Telescope Systems permanent telescope piers meet the exacting requirements of a solid, permanent base for your observing platform while being fully adjustable for precision north polar alignment.
www.advancedtelescope.com   (201 words)

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