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Created with Fabric.js 1.4.5 The Telescope What is a telescope? The telescopes is an optical device used to magnify images from a distance. They contain a series of curved mirrors and lenses to magnify light rays to make the image larger. They are mainly used for astronomyto observe far away plants, galaxies, and other celestial objects. Refracting: These telescopes use lenses to focus light in order to see far away object, It mainly consists of 2 convex mirrors. As the light passes through the convex lens, it bends the light inwardsto make the image look smaller. Types of telescopes and how they work Reflecting: These telescopes consist of a series of mirrors. Mirrors are used because they do not absorb light. When light enters one end, it bounces of a concave mirror. When the light bounces of the concave mirror, it hits a smallerplane mirror which directs it to the eyepiece. There are 2 types of telescopes, refracting and reflecting. History of the telescope The earliest known telescope appeared in 1609 was saidto be invented by Hans Lippershey (or Lipperhey). Once Lippershey took realized the usefulness of this invention,he took it to the Dutch government. They realized how usefulthis invention could be in warfare so they kept it a secret. The secret wasnt well kept and after a year, lens crafters all over Europe were making these small telescopes. A depiction of a dutch telescope in1624 Lippershey himself tried to spread the new to Galileo Galilei, the most productive astronemerand physicist. Galileo Galilei Galileo improved on the design and made a telescope that was so powerful thatit was able to magnify any object30x more. When he looked at the moon, hewas able to see mountains. Price of a Telescope andwho uses it The price of a telescope can be in a huge range from$15- Billions of dollars. Pros Cons - Ground based optical telescopes are susceptible to bad weather. i.e. when the weather is bad you can't do research. - Optical telescopes are heavy to lift into space. - Maintenance on space based optical telescopes is expensive. - it is difficult to hook even two optical telescopes together in an array. - Affected by light pollution coming from urban areas- Placed in remote areas to get away from humanity. - Cannot see through interstellar dust clouds or past very bright star masses. - Easy to build, - Can be very large, - a lot of people can own one thus make contributions. - Can be controlled over the internet. Interesting Facts Anyone has access to to a telescope but mainly astronomersuse this this to observer space and explore the unknownuniverse. The first telescopes were used bymerchents to see incoming trade shipsfirst to beat the competition. The first telescopes were all refracting telescopes. Isaac Newton was the inventorof the reflecting telescope. Telescope derived from the greek wordswhich meant "Far" and "To look and see" An observatory is a remotelocation that houses atleast1 telescope The Hubble Space Telescope is atelescope that was launched in space orbited the Earth for 2 decadesand provides us with a lot of informationabout the universe. Citations Tamara (10/22/2007). Q & A: How Do Telescopes Work?. [ONLINE] Available at: [Last Accessed 3/6/2015]. Telescope Facts. [ONLINE] Available at:[Last Accessed 03/8/2015]. Sandner, L.S, (2009). 'Technologies That Use Light'. In: Lee Ensor (ed),Investigating Science 10. 1st ed. Canada: Reid McAlpine. pp.(482, 488-489). The First Telescopes. [ONLINE] Available at:[Last Accessed 03/7.2015]. By: Omar Dahir Eyepiece - The lens(s) where theeye looks through to see the image Glossary Magnify - Making something look larger than it actually is Concave - Mirrors and lenses that curve outward Convex - Mirror or lenses curving inwards Telescope Tube - The cylindar part ofa telescope that incases everything
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