Telescopes

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Telescopes
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Galileo 1609
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The Moon as a World
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Jupiter has Moons
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Refracting telescopes
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Isaac Newtons reflecting telescope
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Reflecting telescope
Objective mirrors instead of lenses
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Three Powers

• Magnifying
• Resolving
• Light Gathering

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Magnifying Power

• Ability to make objects appear larger in angular
  size
• One can change the magnifying power of a
  telescope by changing the eyepiece used with it
• Mag Power focal length of objective divided by
  the focal length of the eyepiece

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Resolving Power

• Ability to see fine detail
• Depends on the diameter of the objective lens or
  mirror

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Light Gathering Power

• The ability to make faint objects look brighter
• Depends on the area of the objective lens or
  mirror
• Thus a telescope with an objective lens 2 inches
  in diameter has 4 times the light gathering power
  of a telescope with a lens 1 inch in diameter

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Herschel Lord Rosse
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19th century epoch of the large refractors
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Refracting telescopes
Lick
Vienna
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Yerkes Observatory
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20th century Large Reflectors Come of Age
Mount Wilson
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Palomar (5-m)
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4 meter Reflecting telescope
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Objective Mirror
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Dome of 4 meter Kitt Peak
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Keck Telescopes
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Rooftop telescopes
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MSU Campus Observatory
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SOAR Telescope
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SOAR Telescope -- Cerro Pachon
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Astronomical seeing

• Blurring effect of looking through air
• Causes stars to twinkle

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Bad seeing on this side
Good seeing on this side
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Electromagnetic Spectrum
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Radio TelescopesArecibo
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Very Large Array
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Very Large Array
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Observing from space

• No clouds
• Perfect seeing
• Can see wavelengths of light blocked by the
  earths atmosphere

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Hubble Space Telescope
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