Telescopes

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Telescopes

• Chapter 5 The Tools of Astronomy

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Telescope

• Tele distant, far
• Scope- see
• Invented in the 16th century
• First used by Galileo Who found moons around
  Jupiter
• Optical telescopes collect light
• Two types
• Refracting
• Reflecting

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Refracting Telescopes

• Use lenses to bend light
• Larger lenses can gather more light
• So get better picture
• Largest is 40 inches across
• Larger are not possible because the lenses
  distort the light.

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Yerkes Observatory
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Reflecting Telescopes

• Use mirrors to collect light
• First made by Newton
• Mirrors can be larger
• Largest is 200 in. at Mount Palomar near San
  Diego

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• Put telescopes in domes with doors that slide
  open
• Allow them to rotate and elevate
• Point at the same point in the sky as the earth
  turns.

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Multiple Mirror Telescopes

• Large mirrors are hard to make.
• Use several small mirrors that act together
• Gather more light than a single mirror

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Keck Observatory

• 36 mirror hexagon segments- computer controlled
• Largest optical telescope

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The whole spectrum

• Light is a small part of the electromagnetic
  spectrum
• There are telescopes that detect other types of
  waves.
• Radio telescopes- detect radio waves
• Many stars give off mainly radio waves
• Use computers to create an image from the waves.
• Can use several together for even better images

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Radio Telescopes
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Arecibo
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Infrared telecopes

• Infrared is heat energy (warming lamps)
• Dont travel through atmosphere
• Put telescope on a satellite
• IRAS Infrared Astronomy Satellite (1983)
• ISO Infrared Space Observatory (1995)
• Give us images of thingsthat give off little
  energy,like new stars and nebula

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Ultraviolet telescopes

• Also need to be on satellites
• Used to view our sun
• Also found on the Hubble Space Telescope

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X-ray telescopes

• Also need to be on telescopes
• Give information on life cycles of stars.
• Uhuru 1970
• Chandra currently in
• service

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Hubble Space Telescope

• Combination of telescopes optical and
  ultraviolet
• Has been repaired and upgraded twice
• Giving scientists views of the universe they have
  never had before

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