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Tools of Modern Astronomy

Tools of Modern Astronomy. Astronomy Chapter 3.1 Pages 94-100. Telescopes. Collect and focus different types of electromagnetic radiation. Refracting. Reflecting. Refracting Telescope.

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Tools of Modern Astronomy

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  1. Tools of Modern Astronomy Astronomy Chapter 3.1 Pages 94-100

  2. Telescopes • Collect and focus different types of electromagnetic radiation • Refracting • Reflecting

  3. Refracting Telescope • Two convex lenses (thinner at the edges) gather large amounts of light and focus it into a small area. • Galileo used one in 1609 to look at the sky • The larger the lens the more light it can collect

  4. Refracting Telescope Light Rays Objective Lens Eyepiece Lens Focal Length Of objective lens

  5. Reflecting Telescope • Uses a mirror instead of an objective lens • Larger mirrors capture more light • Newton built the first one in 1688 • Today, this is the largest visible telescope.

  6. Reflecting Telescope Eyepiece Lens Light Rays Flat Mirror Curved Mirror

  7. Radio Telescopes • Most have a curved surface 305m in diameter • The surface concentrates the faint radio waves towards an antenna • The larger the telescope the more it can collect.

  8. Radio Telescopes • Used to detect radio waves • Quasars (massive black holes that emits intense radiation as it sucks in stars) and Pulsars (rotating neutron stars)

  9. Spectroscope • Used to analyze properties of light • Can be used to identify elements

  10. RADAR • Radio Detection and Ranging • Developed during WWII to detect enemy aircraft • Now commonly used to track weather formations • Uses beams of microwaves to actively detect objects in space • Range is limited to our solar system.

  11. Other Telescopes • Long Wavelengths<--->Short Wavelengths • Radio/Infrared/Visible/UV/X-Ray/Gamma

  12. Observatories • Building that contains one or more telescopes • Most are built on mountain tops • Less atmosphere and less light pollution from cities • Mauna Kea, Hawaii • 4,200 m above sea level

  13. Observatories • Free of Clouds • No light Pollution • Less Atmosphere

  14. Satellites • Earth’s atmosphere blocks out most of the short wavelengths on the Electromagnetic spectrum • UV, X-Ray and Gamma Rays • Satellites can detect these forms of radiation • Very detailed images

  15. Satellites • Hubble Reflecting Telescope • Collects Infrared, Visible and UV radiation • Chandra X-Ray Observatory • Detects X-rays.

  16. What to Work On • Begin Chapter 2 Unit Review • Pages 90 and 91 • Answer as many questions as you can • Give the page number you found the answer on

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