Telescopes The instruments we use to study the universe.
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Transcript of Telescopes The instruments we use to study the universe.
![Page 1: Telescopes The instruments we use to study the universe.](https://reader035.fdocuments.net/reader035/viewer/2022062803/56649f465503460f94c68a95/html5/thumbnails/1.jpg)
Telescopes
The instruments we use to study the universe
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More about telescopes
• What you will be looking through later in the semester
• Progress in astronomy would have been impossible without them
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Telescopes do two things:
• Collect “Big Piles” of light
• Magnify object (it looks a lot closer than it is)
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Types of Telescopes
• Refractors
• Reflectors
• Radio telescopes
• None of the above
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Reflectors and Refractors
Newtonian
Cassegrain
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Refractors: more details from the book
Demo
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Reflectors: more details from the book
Demo
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Formation of an image
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Magnification of a telescope
The longer the focal length, the higher the magnification
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Modern astronomy: instead of an eyepiece, a Charge-Coupled Device (CCD)
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Keck Telescopes (Reflectors): 10 meter diameter
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Resolution: How small detail can you see with a telescope?
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Resolution: smallest angle measurable
Angle=wavelength/diameter(telescope)
(radians)
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Radio Telescopes
Wavelength large (1cm – 1 meter typically) so D has to be HUGE
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Radio Interferometers:
The ultimate in angular resolution
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Final topic: the disappearing night sky:The US by night; where is it dark?