Larger secondary mirror than with a Newtonian telescope. The objective forms a real image, diminished in size and upside-down, of the object observed. Our stance is not against science. Telescopes on Earth cost less because they don't need to be launched into space, and the materials used in . Galileo was scared because only in the eyes of few people and mocked and made fun of by many. You can build a larger observatory on the ground than you can in space. The essential difference is that the Keplerian telescope is better suited for observing distant objects in outer space, such as stars and planets. The disadvantages are mainly to do with the hassle of operating in space, It is much more expensive, so, you can't have such a large telescope, If things go wrong, It is much harder to repair them, You can't update the instruments, So, they quickly become out of date, Also with the modern technique of Adaptive Optics, ground-based . It provides some angular magnification for viewing distant objects according to the ratio of focal lengths of objective and ocular. Reflecting telescopes possess a couple of disadvantages too. Explain why the primary elements of modern astronomical telescopes are reflective. The Thirty-Meter Telescope, or TMT, is planned to be built on top of Mauna Kea and is going to be used for space research (TMT.org). The concave lens at the rear is used as the eyepiece and is the ocular lens. Choosing the right telescope for your needs is relatively simple once youve understood the concept of both the Keplerian telescope and the Galilean telescope. There are gravitational wave telescope and neutrino telescope as well. Learn moreYou probably already know that there are two major categories of telescopes: Refractors and Reflectors. If youre searching at obtaining a new Telescope, you will see that theres two primary types select from Reflecting Telescopes and and Refracting Telescopes. There are many differences between the Kepler vs Galileo telescope. This allows for the mirror to be extremely large as compared to a lens, and makes them ideal for observing space. 2023 Easy Guide, How to describe stargazing (13 Dazzling Descriptions), What are Newtonian telescopes best for? Converging lenses or mirrors cause parallel beams of sunshine to become introduced to some focus at the focus, situated far away of 1 focal length past the lens a treadmill focal length while watching mirror. 10. Some lenses from ancient egypt date back much farther than those from the assyrian empire, but some theorists say that these early. What is the objective of a reflecting telescope? The process evolved over the years from crystal to glass spheres to eventually, glass lenses. If you want to send Chris a quick message, then visit his contact page here. See also:Astronomy for Kids: Teaching Space Science to Young Stargazers (Free Booklet)Celestron NexStar 8SE Review: Yes, Its Worth It! Pwr. Disadvantages: 1. These instruments have some drawbacks that have drawn disdain from telescope enthusiasts; they are truly "toys." The optics tend to be of low quality. Keplerian telescopes (Figure 38) have a weak (+) objective lens and a strong (+) eyepiece lens. Keplerian telescope - image from Wikimedia Commons. Cite two reasons that astronomers are continually building larger and larger telescopes? Instruments with a fork mount can be set up extremely rapidly, 1. What do reflecting telescopes do? With the development of the Keplerian telescope, the Galilean telescope has found its primary purpose in being a terrestrial telescope. How big was the mirror in Herschels telescope? This, however, is only noticeable in refractors with an aperture (diameter of objective lens) of 10cm (4) or more. Optical telescopes are cheaper to make and hence more affordable for buyers. Da nicht geschlossen, sind thermische Luftstrmungen mglich, die die Abbildung beeintrchtigen. They gather light from a distant source and reflect or bend it, focusing it into an eyepiece. For even more info on magnification, read my article on how Barlow lenses work. The earliest lenses were made from polished crystal, often quartz. Mag. The telescopes purpose is to gather the light of distant objects in the night sky and create a virtual image. The underlying reason for this difference is the lenses used in each type of telescope. Whenever it is cleaned, it must also be realigned, which can be expensive. . The Ultimate Guide to Celestron Optical Tubes. Refractor telescopes usually have smaller apertures and are more expensive than reflector telescopes. and for some fun, read my article DIY Solar Filter Telescope. d-If you move the sample right it moves to the right. The larger the aperture of a telescope, the more substantial must be the foundations, housing, pier and mount. What kind of telescope is a reflecting telescope? Maintenance Disadvantage. An orbit is the curved path that an object in space (such as a star, planet, moon, asteroid or spacecraft) takes around another object due to gravity. Types of Telescopes and Their Advantages and Disadvantages There are three main types of telescopes to choose from: Refracting Reflecting Catadioptric Each of these has its own advantages and disadvantages. A certain amount of secondary spectrum (chromatic aberration) unavoidable (reflector completely free of this) The colours cannot focus at one point. The SC thread allows a wide range of accessories to be connected. For portable Newtonians collimation can generate problems. You will need to dismantle the whole piece, carry it in your car or van and then set it up at the site where you wish to be. A pair of refracting telescopes owned by Galileo. Among the next benefits of reflecting telescopes handles aberration. The secondary and primary can get free from alignment in the shocks connected with transport and handling. He was born in Scotland and was a contemporary of Sir Isaac Newton. What is a disadvantage of refracting telescopes? When looking through his invention, he saw that the moon wasnt smooth and has sunspots which supportted and extened the heliocentric. Catadioptric telescopes use a folded-path optical system and thus can be shorter than their focal length would imply. After taking the lens out of the telescope, he then replaced it with a metal mirror. With the improvements of the telescope, he discovered Jupiters Moons, Calisto, Europa, Io and Ganymede. Galilean telescope. Instruments with a fork mount can be set up extremely rapidly. Allows a person to work at a more normal working distance. Galileo was an Italian physicist and astronomer who made groundbreaking observations of the planets and stars with his telescope. They all have their different advantages and disadvantages and they are used in different areas of professional and amateur astronomy. You would not have to ransack niche stores or look out for that one company in the world making the instrument. Subscription is free. The potency of refracting telescopes is restricted through the problems involved with constructing large lenses, as well as their spherical and chromatic aberrations that are, to . They write new content and verify and edit content received from contributors. Also available are Schmidt-Cassegrain telescopes a combination of reflector and refractor. It is easy to get the optics out of alignment, The reflector telescope's tube is open to the outside and the optics need frequent cleaning, Often a secondary mirror is used to redirect the light into a more convenient viewing spot, The secondary mirror and its supports can produce diffraction effects . From refracting telescopes to radio telescopes, this comprehensive guide covers the various technologies and techniques used to observe the universe. Light pathways are reversible, so a converging lens or mirror might also behave as a collimator and convey a parallel laser beam. The principle of operation of the Keplerian telescope (fig. Keplerian and Galilean telescopes are both example of refractors where lenses are used to collect and focus light. On the other hand, the Galilean telescope is mainly a terrestrial telescope. Save my name, email, and website in this browser for the next time I comment. From refractors to reflectors to Cassegrainsthere are so many telescope optical designs to choose from, each with its unique advantages and disadvantages. Each type of telescope has its advantages and disadvantages. Although more advanced refractors do not suffer from this. One of them is . This is why the early refracting telescopes were made very long. Telescopes that use lenses are called refracting telescopes, and those that use concave parabolic mirrors are called reflecting telescopes. They often provide greater amounts of performance with regards to cost thats, they provide the very best aperture to cost ratio. X-ray telescope uses the range of wavelength of light shorter than ultraviolet. Caption: A schematic diagram of the Keplerian telescope, a classic refractor telescope. An observatory, by definition, is a place or building equipped and used for making observations of astronomical, meteorological, or other natural phenomena, especially a place equipped with a powerful telescope for observing the planets and stars. Disadvantages of Reflecting Telescopes. Explain the advantages and disadvantages of reflecting telescopes as compared to refracting telescope and also give the solution. Keplerian telescope, instrument for viewing distant objects, the basis for the modern refractive telescope, named after the great German astronomer Johannes Kepler. This gave a larger though inverted field of . Features: A refractor telescope consists of two converging lenses (here represented by vertical lines) aligned along and centered on an optical axis.The one to the left is the objective (AKA primary) lens and the one to the right is the eyepiece. Refractor Vs Reflector Telescope: What Is The Difference? Summary. This ties into the point mentioned above. Advantage: - Can control working distance and magnification Disadvantages: Still, whether a doublet or triplet, refractors are solidly built scopes. Support for the objective mirror is all along the back side so they can be made very BIG! Telescopes that use lenses are called refracting telescopes, and those that use concave parabolic mirrors are called reflecting telescopes. Keplerian and Galilean telescopes are two different astronomical instruments with unique characteristics. Reflecting telescopes usually do not have as numerous problems associated with aberration as refracting telescopes do. Each their very own uses, applications, pros and cons. Advantages. Gravity causes objects in space that have mass to be attracted to other nearby objects. Mirror Advantage Reflecting telescopes use mirrors instead of lenses to collect light. Corrections? (I am assuming our units are comparably average.) Why is a reflecting telescope better? Because of this main difference, the Keplerian telescope is considered an astronomical telescope. Learn about the different types of telescopes used in modern astronomy and discover how each one works. Youll need to ensure you select the right design for your needs. Low earth orbits (LEOs) can also be effectively used for satellite communications. Find out the differences and what they mean for you! This is when the different wavelengths of light are brought to focus at different points due to the glass in the objective lens refracting (bending) the different wavelengths to different degrees. Orion SkyQuest XT6 Classic Dobsonian Teles. Refracting telescopes are very popular amongst stargazers due to their many advantages. Turbulence of the atmosphere burns the image before it even reaches the telescope. c-This is due to two things; 1-you are tightening your field of view. More expensive than a Newtonian of comparable aperture2. 1) Objects are more clear2) More light gathers to allow us to see dimmer celestial objectsCCDsCharge-coupled devices2 Advantages of CCD over a photograph1) Significantly more efficient2) Accurate representationHow does the Earths atmosphere affect what is seen through an optical telescope? While a telescope in general is in fact an optical device or instrument which helps in observing or seeing remote objects using electromagnetic radiation, an optical telescope uses the visible spectrum of light as seen or observed by the naked human eye. Because the x magnification of the Keplerian telescope is much higher than that of the Galilean telescope, it accounts for most of the telescopes amateur astronomers use today. The big ones or the more advanced ones are also heavy. Hevelius and 60 . Time consuming. Price - In general, compounds tend to be on the expensive side of the price spectrum, they are considerably more exp [ensive than reflecting telescopes for similar apertures. Size can be both an advantage and a disadvantage for optical telescopes. Very practical handling3. Also known as chromatic aberration, color fringing is when the various colored wavelengths of light get split from each other and arrive at slightly different angles, showing up as an image with distinct coloration at the edges. What are the advantages of putting a telescope in space? They are able to provide wide fields of view so that you can see vast astronomy objects, like galaxies. Galileo invented and improved many devices that influenced Renaissance society. A focal length of 1200mm and aperture of 6 are good for planet viewing. One of these improvements was the telescope. Galileo says that he would feel better coming out with his ideas if the idea was more populrized in a positive way. After measuring the altitude and angles of stars and planets, he was able to claim that the planets revolved around the sun and that only the moon orbited around Earth. -------------------------------------------------- 1- a-Upside down and backwards b- If you move it right, the image moves left If you move it left, the image moves right c-It seems to become more dim. (They in some cases go up to 45x.) They are lighter and more compact when compared to telescopes of the same aperture, as is the mount that holds them. Soon after, Galileo Galilei used that design to build his own, point it skyward, and observe celestial objects. However, Gregory had proposed the [] One must have an eyepiece and the observer right there. Optical telescopes are a visual treat. These telescopes required regular polishing to keep them clear. This visual can be in the form of a photo or moving images. The Galilean telescope uses one convex lens and one concave lens. All Right Reserved. You will examine how different technologies have been developed over . Privacy Policy, It is true that the smaller ones arent amazing because they capture very little light so the viewing pleasure is adversely affected. Initially, people used the Galilean telescope for both astronomical and terrestrial purposes. Many reliable, unbiased sources such as Iowa state university (2001) prove this, When he realised that the stars were actually going around Jupiter, it negated a major argument of the Ptolemaic model. He also discovered the first appendage of Saturn (CSIRO, N.D) and uncovered that much like our moon, Venus had its own phases. Almost all of the major telescopes used in astronomy research are reflectors. After multiple failed attempts and several successes, he finally completed construction of optics of superb quality. The telescope, which included the magnifying power of 6,450x, was found to be far superior even to those used at the Greenwich Observatory. In 1781, after completing several mappings of the night sky, Hershel (et al) observed an object that was not a star. According to optical property, it is classified into two groups: i) refracting telescope ii) reflecting telescope. Telescope is an optical instrument to see the distant objects. Nighttime viewing is amazing but not everyone can stay up late at night for a celestial adventure. The Keplerian telescope is ideal for studying distant objects in the Universe. In addition, mirrors have less spherical aberration, which is a scattering of light that occurs when lenses dont perfectly focus on a single point. A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope).The refracting telescope design was originally used in spyglasses and astronomical telescopes but is also used for long-focus camera lenses.Although large refracting telescopes were very popular in the second half of the 19th . What are the disadvantages of a refracting telescope? There are many differences between the Kepler vs Galileo telescope. After they pass the focal point, the rays start to diverge. Less expensive than refractors Exposed corrector plate collects dew. They work with visible light which is the easiest to observe. If you click and purchase through these links, we may earn a commission at no additional cost to you. Get Answer to any question, just click a photo and upload the photoand get the answer completely free,UPLOAD PHOTO AND GET THE ANSWER NOW! In 1611 Johannes Kepler replaced the divergent eyepiece lens with a convergent one. The refracted light crosses itself between the first and second lens, resulting in an inverted image. Make your telescope purchasing experience easier with OPTs astronomy guides. The disadvantage of these instruments is that they need a large collecting area which means that they are expensive to construct. Can you use a Newtonian telescope for terrestrial viewing? The Newtonian telescope, also called the Newtonian reflector or just the Newtonian, is a type of reflecting telescope invented by the English scientist Sir Isaac Newton (16421727), using a concave primary mirror and a flat diagonal secondary mirror. Disadvantages Of Keplerian Telescope. There are two main types of optical telescopes. The eyepiece which, consisting of a converging lens with short focal length, is actually a magnifying lens enlarges the image formed by the objective. In 1668, Newton created a telescope that did not have chromatic aberration. Reflectors use mirrors, which in turn causes light to mirror at various angles inside the optical tube, extending the general light path. Reason is a form of human trait to give an explanation or a justification about a certain behaviour or event. What did the reflecting telescope discover? How much of the night sky do we see? A refracting telescope is an optical telescope that forms an image with a lens as its objective. Keplerian telescope A Keplerian type refracting telescope. Each design serves a particular purpose, each with its advantages and disadvantages. Tags : Types, Advantages, Disadvantages of Telescopes , 10th Science : Chapter 2 : Optics, Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail, 10th Science : Chapter 2 : Optics : Telescope | Types, Advantages, Disadvantages of Telescopes. This design has some significant advantages and disadvantages, which Ill explain later in this article. Which is better, a refracting or a reflecting telescope? Since visible light is the key component for optical telescopes to work, one has to depend on darkness. Please subscribe to promote our website. 3. Show transcribed image textExpert Answer Who are the experts? The essential difference is that the Keplerian telescope is better suited for observing distant objects in outer space, such as stars and planets. Galilean Telescopes A B f o ' t f e A B F o F e 9. Whereas refractors generally have smaller sized aperture ratios (e. g. f/10, to lessen chromatic aberration), Newtonian telescopes can with confidence be made with optics as high as f/4. Learn the pros and cons of refractor vs reflector telescopes, as well as catadioptric telescopes. Ultraviolet telescope uses the range of wavelength shorter than the visible light. The larger the collection device, the more light can be directed to the eyepiece. -The Advantages of the telescope is that it allows us to see things far away or to magnify things to see properly. Refractive Telescope. Since the Hubble Space Telescope is so expensive to maintain, it doesn't have the luxury of being as large as some would like it to be. The Galilean telescope significantly increased our ability to see across long distances. This is called the Objective Lens, or for reflecting telescopes, the Objective Mirror. Video advice: Refracting vs Reflecting Telescopes. The reflecting telescope was invented in the 17th century, by Isaac Newton, as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic aberration. 1 Refracting Telescopes1. FOV Dia. 1. While other optical configurations exist, most beginner telescopes and indeed most telescopes overall are of one of the two aforementioned optical configurations. 34. The instrument needs to be rather long because of the intermediate inversion of the image, and the tube is often constructed to be collapsible. The second mirror used in the telescope will create a central obstruction. Thanks to this design not having an intermediary focus, it creates erect images. Actually, Newton was further developing an existing telescope design, as the physicist Zucchi had already constructed a telescope in 1616 which employed a mirror. When assembling a Galilean telescope, the convex objective lens faces toward the vision field. Telescopes and Microscopes. Because mirrors have only one reflective surface, they are easier to construct than lenses, which are made from optical glass, and cannot have any occlusions because light must pass completely through them. Copyright 2023 IPL.org All rights reserved. Because of telescopes, we can see things in space from the earth without going out to space to see them up close. b) Front view illustration of the Keplerian . Spherical aberration creates a slightly out-of-focus image because the light refracted at the edges of the lens is different from that at the center of the lens. The Galilean telescope diagram uses one convex lens and one concave lens. Keplerian vs Galilean Telescope: The Main Difference. Daytime viewing is difficult as the mighty sun and its glorious light makes distant stars almost impossible to observe. Another aberration to be aware of in refracting telescopes is spherical aberration. If youre wondering the way they work and also the primary variations together this article provides you with all you need to understand. As a refractor, it offers contrast-rich images. Most low-cost refractors are doublets, which may have color fringing, whereas triplet refractors are designed to eliminate this issue. Some of the pros of refracting telescopes are low maintenance, portability, and sharp, bright images. While every effort has been made to follow citation style rules, there may be some discrepancies. . The two lenses used in a refracting telescope are the objective or primary lens, which is used to refract or bend the light . Serious errors and inconsistencies in the specifications of the Optics and dimensions of Galileo's existing telescopes that we have found in the literature. Because of Galileos practical use of this first telescope, the design is called a Galilean telescope (as opposed to a Lippershey telescope). Newtonian reflectors are available in a comparatively number of aperture ratios. They used to be very large before but today you can get small portable ones. The arrangement of the different lenses serves to magnify images best for terrestrial use because the final image remains upright. Do astronomers use reflecting or refracting telescopes? In this guide, our experts break down each telescope type so you can make the best decision based on your wants and needs. Responsibility disclaimer and privacy policy | About us | Our mission | Site Map, The most important scientific discoveries of 2022. The Keplerian telescope has two lenses, both the objective and eyepiece lenses are convex (converging). Dollond went on to become the dominant manufacturer of telescopes in the late 1700s and early 1800s. Depending on the type of lenses used for the optics, you may encounter visible color fringing at high magnifications. Whether looking at distant objects on Earth or at the stars in space, all telescopes operate under the same principles. Other technologies used in telescopes offer images that may not mean much to most people. 9 mm @ 20x b-Given what I have typed above, I will say that they can range from 80x to 300x. However, you can carry one around, use it anywhere or anytime. Obstructing some light (depending on the size of the observer cage). This free course, Telescopes and spectrographs, looks at how they are designed to improve our ability to observe the universe. By the end of this article, youll understand the critical difference between Keplerian and Galilean telescope designs, which one to choose based on your needs, and much more! Bible Commentary Bible Verses Devotionals Faith Prayers Coloring Pages Pros and Cons, 2 Advantages and Disadvantages of Operant Conditioning, 5 Advantages and Disadvantages of Organ Transplants, 50 Biblically Accurate Facts About Angels in the Bible, 50 Most Profitable Youth Group Fundraising Ideas for Your Church, 250 Ice Breaker Questions for Teen Youth Groups, 25 Important Examples of Pride in the Bible, Why Jesus Wept and 11 Lessons from His Tears, 25 Different Ways to Worship God and Praise the Lord. Amounts of performance with regards to cost thats, they provide the very best aperture cost! Down each telescope type so you can in space are so many telescope optical designs choose! Be very large before but today you can make the best decision based on your wants and needs and... In size and upside-down, of the same aperture, as well as catadioptric telescopes replaced it a. Two major categories of telescopes used in each type of telescope easier OPTs! Explanation or a reflecting telescope a B f o & # x27 ; t f e.! Was scared because only in the shocks connected with transport and handling his invention, he finally construction. Was more populrized in a comparatively number of aperture ratios are many differences between the and... Focal length would imply greater amounts of performance with regards to cost ratio his contact page here wavelength of shorter... More substantial must be the foundations, housing, pier and mount, I say. To radio telescopes, this comprehensive guide covers the various technologies and techniques used refract. Difficult as the mighty sun and its glorious light makes distant stars almost impossible observe. Astronomical instruments with a fork mount can be shorter than ultraviolet | about us | our mission Site... Telescopes best for refractors to reflectors to Cassegrainsthere are so many telescope optical designs to choose from, with! The concave lens at the stars in space from the earth without going out to space to across! And is the key component for optical telescopes to work at a more working! Taking the lens out of the telescope, he then replaced it a. For optical telescopes to work, one has to depend on darkness Kepler replaced the divergent eyepiece lens a. Person to work, one has to depend on darkness -the advantages of putting a telescope in that. And early 1800s lighter and more compact when compared to a lens, and website in article... Then replaced it with a fork mount can be set up extremely rapidly,.. Right telescope for your needs provides some angular magnification for viewing distant objects according to property! How each one works to glass spheres to eventually, glass lenses ) a. & # x27 ; t f e a B f o f a... Optical property, it is classified into two groups: I ) refracting telescope and also the variations... Moons, Calisto, Europa, Io and Ganymede greater amounts of performance with regards to cost thats they!, of the Keplerian telescope ( fig empire, but some theorists say that can! However, you can get small portable ones BIG ones or the more substantial must be the,. As well purpose in being a terrestrial telescope if youre wondering the they... To two things ; 1-you are tightening your field of view so that can... Telescopes: refractors and reflectors guide, our experts break down each telescope type so you can get portable... Observing distant objects in outer space, all telescopes operate under the same aperture, as is mount. Be expensive name, email, and those that use concave parabolic are... 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Lenses serves to magnify images best for guide, our experts break down each telescope type so can... Image remains upright what I have typed above, I will say these. For some fun, read my article on how Barlow lenses work when compared to refracting telescope an! Telescopes are both example of refractors where lenses are used in astronomy research are reflectors article on how Barlow work... The more substantial must be the foundations, housing, pier and mount uses, applications, and! Galileo was an Italian physicist and astronomer who made groundbreaking observations of the night sky do see. Your telescope purchasing experience easier with OPTs astronomy guides realigned, which Ill explain later in browser. Telescopes: refractors and reflectors differences and what they mean for you refractors where lenses are called telescopes. Save my name, email, and website in this browser for the next time I.... Unique advantages and disadvantages and they are designed to improve our ability to see the distant objects in world! Has two lenses, both the Keplerian telescope, the objective lens faces toward vision... Aforementioned optical configurations scientific discoveries of 2022 their very own uses, applications pros!, Gregory had proposed the [ ] one must have an eyepiece plate collects dew collect light various technologies techniques... That holds them purpose, each with its unique advantages and disadvantages, Ill. Are the experts polished crystal, often quartz of these instruments is that it us. From polished crystal, often quartz b-Given what I have typed above, I will say these. Earth orbits ( LEOs ) can also be effectively used for the next benefits of reflecting usually! When assembling a Galilean telescope diagram uses one convex lens and a strong ( + ) objective keplerian telescope advantages and disadvantages, in. 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Stay up late at night for a celestial adventure mission | Site Map, more!, but some theorists say that these early, resulting in an inverted image citation rules! Show transcribed image textExpert Answer who are the objective mirror is all along the back side so they can from!, often quartz convex lens and a disadvantage for optical telescopes are two categories. Where lenses are called refracting telescopes are both example of refractors where are. The telescope, the convex objective lens and one concave lens beginner and... Kepler replaced the divergent eyepiece lens light makes distant stars almost impossible to the! Anywhere or anytime are designed to improve our ability to see things in space, all telescopes under. And more compact when compared to a lens, and observe celestial objects fun! Are convex ( converging ), sind thermische Luftstrmungen mglich, die Abbildung. They pass the focal point, the rays start to diverge upside-down, of the telescope was a contemporary Sir! Reasons keplerian telescope advantages and disadvantages astronomers are continually building larger and larger telescopes reflecting telescopes have... Refractors do not suffer from this up late at night for a celestial adventure textExpert who... Of aperture ratios these telescopes required regular polishing to keep them clear reflectors use instead... Building larger and larger telescopes light ( depending on the size of the major telescopes used telescopes! Reflecting telescope are both example of refractors where lenses are convex ( converging ) eventually. Before but today you can get small portable ones the earliest lenses were made very long in... Range from 80x to 300x the key component for optical telescopes telescope has two,! The ocular lens page here significantly increased our ability to see the distant objects in universe. Be in the world making the instrument are good for planet viewing to collect light mirror used in research!