Telescopes The instruments we use to study the universe.

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Presentation transcript:

Telescopes The instruments we use to study the universe

More about telescopes What you will be looking through later in the semester Progress in astronomy would have been impossible without them

Telescopes do two things: Collect “Big Piles” of light Magnify object (it looks a lot closer than it is)

Types of Telescopes Refractors Reflectors Radio telescopes None of the above

Reflectors and Refractors Newtonian Cassegrain

Refractors: more details from the book Demo

Reflectors: more details from the book Demo

Formation of an image

Magnification of a telescope The longer the focal length, the higher the magnification

Modern astronomy: instead of an eyepiece, a Charge-Coupled Device (CCD)

Keck Telescopes (Reflectors): 10 meter diameter

Resolution: How small detail can you see with a telescope?

Resolution: smallest angle measurable Angle=wavelength/diameter(telescope) (radians)

Radio Telescopes Wavelength large (1cm – 1 meter typically) so D has to be HUGE

Radio Interferometers: The ultimate in angular resolution

Final topic: the disappearing night sky: The US by night; where is it dark?

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