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8 th  Grade: Chapter 2 Lesson 2 Pgs. 68-74 For Student Use Only
Visible Light <ul><li>Light: </li></ul><ul><ul><li>Astronomers use the telescope to look at the world. </li></ul></ul><ul>...
Visible Light <ul><li>Refracting Telescope: </li></ul><ul><ul><li>It is made from a closed tube with an objective lens (la...
Visible Light <ul><li>Reflecting Telescope: </li></ul><ul><ul><li>Uses a large curved mirror in place of an objective lens...
Visible Light <ul><li>Reflection Telescopes: </li></ul><ul><ul><li>Largest Reflecting Telescope: </li></ul></ul><ul><ul><u...
Visible Light <ul><li>Telescopes: </li></ul><ul><ul><li>Astronomers use telescopes and cameras. </li></ul></ul><ul><ul><ul...
Visible Light <ul><li>Light Spectrum: </li></ul><ul><ul><li>Spectroscope: a device that splits light into a spectrum for a...
Visible Light <ul><li>Radio Astronomy: </li></ul><ul><ul><li>The weather often causes problems for optical telescopes. </l...
Visible Light <ul><li>Radio Astronomy: </li></ul><ul><ul><li>The largest fully maneuverable radio telescope is in Germany ...
Visible Light <ul><li>Singing Stars: </li></ul><ul><ul><li>Radio Telescopes let astronomers listen to stars (and the radio...
Visible Light <ul><li>Radio Telescopes: </li></ul><ul><ul><li>Scientists have used radio telescopes to take pictures of Ve...
Visible Light <ul><li>Overcoming Obstacles: </li></ul><ul><ul><li>Astronomers probing the heavens with visible light have ...
Visible Light <ul><li>Overcoming Obstacles: </li></ul><ul><ul><li>NASA put a telescope above the thickest part of the atmo...
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8th Grade Chapter 2 Lesson 2

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8th Grade Chapter 2 Lesson 2

  1. 1. 8 th Grade: Chapter 2 Lesson 2 Pgs. 68-74 For Student Use Only
  2. 2. Visible Light <ul><li>Light: </li></ul><ul><ul><li>Astronomers use the telescope to look at the world. </li></ul></ul><ul><ul><ul><li>There are 2 types of visible light telescopes: </li></ul></ul></ul><ul><ul><ul><ul><li>Refracting Telescope: Uses lenses to gather light and form an image </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Reflecting Telescope: uses lenses and mirrors to produce an image </li></ul></ul></ul></ul>
  3. 3. Visible Light <ul><li>Refracting Telescope: </li></ul><ul><ul><li>It is made from a closed tube with an objective lens (large convex lens) at the top and an eyepiece (small convex lens) at the bottom. </li></ul></ul><ul><ul><ul><li>Objective lens- collects light, bends (refracts) rays of light </li></ul></ul></ul><ul><ul><ul><li>Focal point- the point where light rays converge (meet) </li></ul></ul></ul><ul><ul><ul><li>Eyepiece: magnifies the image and enlarges the picture </li></ul></ul></ul>
  4. 4. Visible Light <ul><li>Reflecting Telescope: </li></ul><ul><ul><li>Uses a large curved mirror in place of an objective lens </li></ul></ul><ul><ul><li>Lenses refract different colors of light at different angles and makes it hard to keep images sharp; BUT, mirrors reflect colors at the same angle and produce a sharper image </li></ul></ul><ul><ul><li>When parallel beam of light falls onto parabolic mirror, they reflect and are brought to focus at a point in front of the mirror. </li></ul></ul>
  5. 5. Visible Light <ul><li>Reflection Telescopes: </li></ul><ul><ul><li>Largest Reflecting Telescope: </li></ul></ul><ul><ul><ul><li>394 inch (10 meter) main mirror </li></ul></ul></ul><ul><ul><ul><li>Located in Hawaii </li></ul></ul></ul><ul><ul><ul><li>W. M. Keck Observatory </li></ul></ul></ul>
  6. 6. Visible Light <ul><li>Telescopes: </li></ul><ul><ul><li>Astronomers use telescopes and cameras. </li></ul></ul><ul><ul><ul><li>Use of camera help astronomers study the composition of stars. </li></ul></ul></ul><ul><ul><ul><li>Certain gases allow certain colored light to pass through due to the make up of gas. </li></ul></ul></ul><ul><ul><ul><ul><li>Absorption Lines: dark lines that show which light has been absorbed. </li></ul></ul></ul></ul>
  7. 7. Visible Light <ul><li>Light Spectrum: </li></ul><ul><ul><li>Spectroscope: a device that splits light into a spectrum for analysis </li></ul></ul><ul><ul><li>Spectrograph: device used to study the spectra produced by the spectrascope </li></ul></ul><ul><ul><ul><li>These devices help scientists know what elements are in each stars </li></ul></ul></ul>
  8. 8. Visible Light <ul><li>Radio Astronomy: </li></ul><ul><ul><li>The weather often causes problems for optical telescopes. </li></ul></ul><ul><ul><ul><li>Clouds, smog, and haze can hinder view of the stars. </li></ul></ul></ul><ul><ul><ul><li>Scientists use radio waves to also study stars. These can be studied rain or shine and can see things the eye cannot. </li></ul></ul></ul><ul><ul><ul><ul><li>Radio Telescope- instrument that collects radio waves from space. </li></ul></ul></ul></ul>
  9. 9. Visible Light <ul><li>Radio Astronomy: </li></ul><ul><ul><li>The largest fully maneuverable radio telescope is in Germany </li></ul></ul><ul><ul><ul><li>Effelsberg telescope is 328 foot long </li></ul></ul></ul><ul><ul><li>Largest Stationary Radio Telescope: </li></ul></ul><ul><ul><ul><li>Built in a natural depression in the mountains of Puerto Rico. </li></ul></ul></ul><ul><ul><ul><li>It is 1000 ft. across </li></ul></ul></ul>
  10. 10. Visible Light <ul><li>Singing Stars: </li></ul><ul><ul><li>Radio Telescopes let astronomers listen to stars (and the radio waves that it produces) </li></ul></ul><ul><ul><ul><li>Pulsars- are stars that produce rapid bursts of radio waves </li></ul></ul></ul><ul><ul><li>Revelations: </li></ul></ul><ul><ul><ul><li>Computer technology has helped astronomers study even more with Radio Astromomy. </li></ul></ul></ul>
  11. 11. Visible Light <ul><li>Radio Telescopes: </li></ul><ul><ul><li>Scientists have used radio telescopes to take pictures of Venus </li></ul></ul><ul><li>Radio telescopes have also helped to discover BLACK HOLES </li></ul><ul><ul><li>Black Hole: an object that is so massive and dense that that not even light is fast enough to escape from its surface. </li></ul></ul>
  12. 12. Visible Light <ul><li>Overcoming Obstacles: </li></ul><ul><ul><li>Astronomers probing the heavens with visible light have always contended with several obstacles to their observations. </li></ul></ul><ul><ul><ul><li>Extreme Faintness of the light </li></ul></ul></ul><ul><ul><ul><li>Earth’s atmosphere: </li></ul></ul></ul><ul><ul><ul><ul><li>Air currents make the stars twinkle, but ruin pictures. </li></ul></ul></ul></ul>
  13. 13. Visible Light <ul><li>Overcoming Obstacles: </li></ul><ul><ul><li>NASA put a telescope above the thickest part of the atmosphere </li></ul></ul><ul><ul><ul><li>This was to overcome the shimmering of the stars </li></ul></ul></ul><ul><ul><li>Telescopes are put in space to help overcome obstacles. </li></ul></ul><ul><ul><ul><li>Hubble Space Telescope helps astronomers see into space </li></ul></ul></ul>

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