Lecture 7 – September 10, 2003 Telescopes

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Presentation transcript:

Lecture 7 – September 10, 2003 Telescopes What have you been looking through these nights? 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

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

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

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

Radio Interferometers: The ultimate in angular resolution