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Telescopes
A telescope is a device used to form images of distant objects. There are two kinds: an optical telescope uses lenses and is known as a refracting telescope or a refractor, and a reflecting telescope, which uses a mirror and is known as a reflecting telescope or a reflector. The earliest telescope was a refractor built by the Dutch eyeglass maker Hans Lippershey. This category is for questions related to telescopes, including using them to view distant planets and objects in space.
1,887 Questions
Amateur astronomers have built their own radio telescopes in their back yards for a couple of hundred dollars in spare electronic junk parts. It is especially inexpensive if you happen to have access to an old 6-foot satellite TV "dish" antenna. If you have a little electronics experience - as a "HAM" radio operator, for example - it's easy to do.
Of course, bigger dishes are more expensive.....
One of the ways around the problem of big, heavy, expensive dish antennas is to create an array of smaller dishes that are all aligned together. This is the concept behind the Very Large Array of radio telescopes. And when your sponsor is Paul Allen, business partner of Bill Gates, things like the Allen Radio Telescope is pocket change in comparison.
Why do astronomers use as few lenses as possible in their telescopes?
Astronomers use fewer lenses in telescopes to minimize light loss due to absorption and reflection by the lenses. Each additional lens in the optical path can reduce the amount of light that reaches the eyepiece, affecting the image quality. Additionally, fewer lenses can help reduce chromatic aberration and other optical imperfections.
How do you help fix the telescope on club penguin?
you use the wrench on your spy phone.
to get to the wrench on your spy phone you click tools and you will see a wrench.
a spy phone is the blue phone in your inventory during missions.
Is the Worlds largest telescope refracting or reflecting?
Large lenses deform under their own weight, but mirrors can be supported. Reflectors do not suffer from chromatic aberration like refractors do. Large mirrors need only one optical surface, achromats four surfaces to grind.
Large, very clear lenses are harder to cast than more tolerant mirror blanks.
How big are the mirrors on the Keck telescope?
The primary mirrors on the Keck Telescope are 10 meters (33 feet) in diameter. Each mirror is composed of 36 hexagonal segments that work together to form the complete reflective surface.
Who invented theCassegrain telescope?
Laurent Cassegrain, a French priest and astronomer, invented the Cassegrain telescope in the mid-17th century. The design features a concave primary mirror with a secondary convex mirror, allowing light to be reflected back through a hole in the primary mirror for viewing.
Do lenses reflect or refract light?
Light refracts when it passes across the boundary of two media having different optical densities (refractive indexes). If the light stated in the question had done this, then it is refracted.
How does a refracting telescope produce an image?
A refracting telescope works just like a magnifying glass. It uses a convex glass lens (to bend light and bring it into focus. This lens is thicker in the center than it is toward its edges, which bends the light more at the edge of the lens than light coming through the center. This allows all of the light to come together at a focus point. The point of focus is where the image is created.
If someone looks into the eyepiece, a concave lens magnifies the image
Refracting telescopes have two main problems-images are not always clear because the light is being bent and the size of the lens is limited (which limits the power of the telescope).
There have been a number of problems with the Hubble Space Telescope over the years. Possibly the most serious was that the primary mirror of the telescope was incorrectly made; it was out of focus! Since there was no way to test it prior to launch, scientists didn't discover this until AFTER it had already been launched from the Space Shuttle and released into orbit. It was a GIANT disappointment. (The Hubble Space Telescope couldn't be tested on the ground, because the structure isn't strong enough to support its own weight in gravity.)
For almost a year, the Hubble's telescope was as blind as man with broken glasses. Another Shuttle mission was required to install a corrective lens and bring the pictures back into proper focus.
Since then the biggest problems have been batteries, computer systems and gyroscopes; several gyros have been replaced, and the main computer was replaced, and new more powerful instruments installed just this summer. At the moment, I believe that everything is working properly.
What is the wavelength of a infrared telescope?
Visible light is about 350-700 nm, so infrared radiation would have a wavelengt above 700 nm (0.7 microns), approximately. It is not a single wavelength, but a wide range of wavelengths. The upper range is about 300 microns. Wavelengths above that are called microwaves.
What is the name of a Visual telescope satellite in space?
An orbiting telescope is a telescope that transferring infared light into visual light while orbiting in space.An orbiting telescope is a telescope that transferring infared light into visual light while orbiting in space.
Where can you buy a telescope in Memphis Tennessee?
You can buy a telescope in Memphis, Tennessee at specialty shops like Sudekum Planetarium Gift Shop, camera stores like Memphis Camera & Repair, or online retailers like Amazon or OpticsPlanet.
What problem do refractor telescopes have that reflectors dont?
There are several disadvantages with a refracting telescope.
1. Chromatic aberration is one, where all colours are not focused at the same point.
2. The mass of the lens, if large, could cause it to change shape as it is moved.
3. It is essentially impossible to have an optically perfect lens surface, and any minute imperfection causes 'confusion' of the light ray passing through that point.
4. Any lens surface will cause some reflection of light - light lost to the detector at the end point. You must have seen reflections of yourself, or of some landscape, from an ordinary transparent window glass. These reflections will re-reflect within a lens system, causing some optical confusion - loss of quality of the image.
Large modern reflector type telescopes avoid these problems by minimizing the number of glass surfaces between the incoming light and the recording surface. These days, the recording surface is usually a cmos, or similar, solid state detector.
Yes, the Hubble Space Telescope was built to observe objects in space without the distortion caused by Earth's atmosphere. By being located above Earth's atmosphere, the Hubble Telescope can capture clearer and more detailed images of celestial objects.
What planet has the highest mountain and what its name?
Mars has the largest mountain in the Solar System, Olympus Mons. 600KM in diameter and 21KM high. (370Miles by 13Miles)
Do people in the US make telescopes?
Yes, there are companies in the US that manufacture telescopes for amateur and professional use. Some well-known telescope manufacturers based in the US include Celestron and Meade Instruments. These companies produce a wide range of telescopes for astronomy enthusiasts.
What and where are the largest optical telescopes in use today?
The largest optical telescope in use today is the Gran Telescopio Canarias (GTC) located at the Roque de los Muchachos Observatory in La Palma, Canary Islands. It has a primary mirror diameter of 10.4 meters (34 feet). Another large optical telescope is the Keck Observatory in Hawaii with two telescopes, each with a primary mirror diameter of 10 meters (33 feet).
What is the microwave wave length in meters?
The typical wavelength of microwaves used in microwave ovens is around 12.2 centimeters or 0.122 meters.
Largest visible light telescope?
The largest visible light telescope is the Gran Telescopio Canarias (GTC) located in the Canary Islands, Spain. It has a primary mirror with a diameter of 10.4 meters, making it one of the largest optical telescopes in the world.
Why do reflecting telescopes cost less than refracting telescopes?
The objective lens of the REFRACTING telescope has to be a single gigantic piece of perfect glass.
The light being observed goes all the way through it, so any imperfection anywhere ... on either surface or
anywhere INSIDE it ... can affect the quality of the image. It also has to be totally stable and rigid, since
it can only be supported around the edge.
The mirror of the REFLECTING telescope only has to have a perfect SURFACE. The light hits the surface and
bounces off of it, so nobody cares what happens behind the surface. The mirror can be made of two-by-fours
or old crushed beer cans, and it can be supported by a solid rigging of carpenter's scaffold. Just as long as
it has a perfect front surface, we don't care.
For any large size you want for the objective element ... large enough to be attractive as a muscular
astronomical instrument ... it turns out to be much easier and cheaper to build a parabolic mirror of that
size than to build a perfect lens of the same size.
Do astronomers use ground-based X-ray telescopes?
Yes, astronomers use ground-based X-ray telescopes to study high-energy phenomena in space. These telescopes are typically located at high-altitude sites to reduce interference from Earth's atmosphere and are used to observe sources such as black holes, neutron stars, and supernova remnants.
X-ray telescopes are located in orbit around the Earth because?
X-ray telescopes are placed in orbit around the Earth to avoid absorption of X-rays by Earth's atmosphere. By being in space, these telescopes can capture high-energy X-ray emissions from celestial objects that do not reach the surface due to the atmosphere.
Where is the Chandra telescope located?
The Chandra X-ray Observatory is located in space, in Earth's orbit. It was launched aboard the Space Shuttle Columbia in 1999 and has been observing the universe in high-energy X-rays ever since.
On panfu how do you get to the middle of the volcano with the telescope?
To reach the middle of the volcano with the telescope on Panfu, you need to first enter the volcano by sliding down the lava stream. Once inside, you need to navigate through the cave by jumping on platforms and avoiding obstacles until you reach the telescope in the middle.
What is the reason why most professional research telescopes are reflectors?
Most professional research telescopes are reflectors because reflective surfaces provide higher light-gathering capabilities, allowing for the collection of more light and producing brighter images. Reflectors are also easier to construct in larger sizes compared to refracting telescopes, which helps in observing fainter astronomical objects. Additionally, mirrors used in reflectors are less affected by chromatic aberration, improving the overall image quality.
