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POD

POD Draw the image of Patrick through the lens below using a ray diagram. F F Targets Explain how a refracting telescope works. What are the key parts? Draw a sketch. Telescope Lab. Telescope Targets Describe the different types of telescopes. Explain how telescopes work.

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POD

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  1. POD • Draw the image of Patrick through the lens below using a ray diagram. F F

  2. Targets • Explain how a refracting telescope works. • What are the key parts? Draw a sketch.

  3. Telescope Lab.

  4. Telescope Targets • Describe the different types of telescopes. • Explain how telescopes work. • Describe how the electromagnetic spectrum is organized.

  5. What Tools are used to explore Space? • Human Eye • Telescopes • Satellites • Probes

  6. What do Telescopes “see”? The Electromagnetic Spectrum

  7. What do Telescopes do? • 1.) Collect far more light than the unaided eye. • 2.) Magnify the image. • Example: use a magnifying glass to look at the image from the “spaceship” reflector.

  8. Optical Telescopes: • Most used telescope today • Best locations are on mountain peaks in dry climates • Use lenses or mirrors to gather and focus starlight • Usually kept in buildings with domed roofs to protect it from weather and temperature changes.

  9. Telescope • Has two lenses, an Objective Lens and the eyepiece. • Objective Lens - Gathers light and bends the rays of light to form an image in the eyepiece • (Objective/Object - closest to the object) • Eyepiece - Magnifies the object. • Large Refracting Telescopes are not being built today because telescopes with mirrors are cheaper and easier to build.

  10. Telescope • Uses two mirrors and one lens (the eyepiece). • Primary Mirror - A large curved mirror to gather and focus light. The light is then reflected to the Secondary Mirror. • Secondary Mirror – Reflects the image to the observer. • Eyepiece – magnifies the image.

  11. Multiple Mirror Telescope • Several mirrors take the place of a single, large mirror • less expensive than most other types of telescopes

  12. Radio Telescope • Radio telescopes, or antennas, collect faint radio waves from natural celestial objects (e.g. planets, stars and other galaxies). • The data is collected and then analyzed using powerful computers and software designed specifically for this purpose. From: National Radio Astronomy Observatory, http://www.nrao.edu/

  13. Green Bank Telescope (GBT), located in West Virginia, is the world's largest fully steerable radio telescope. (140-ft Telescope in background)

  14. The Very Large Array (VLA) in Socorro, New Mexico consists of 27 antennas, each measuring 25 meters in diameter and weighing approximately 200 tons

  15. National Radio Astronomy Observatory • Images

  16. Spitzer Infra-red Telescope The Spitzer Space Telescope was launched into space on 25 August 2003. • 2.5-year mission. • Spitzer obtains images and spectra by detecting the infrared energy, or heat, radiated by objects in space between wavelengths of 3 and 180 microns (1 micron is one-millionth of a meter). http://www.spitzer.caltech.edu/about/index.shtml

  17. Spitzer Space Telescope

  18. Double Helix Nebula • The double helix nebula. The spots are infrared-luminous stars, mostly red giants and red supergiants. Many other stars are present in this region, but are too dim to appear even in this sensitive infrared image.

  19. Spitzer Space Telescope • More Images….

  20. Hubble Space Telescope • Observes the Universe at ultraviolet, visual, and near-infrared wavelengths. • The Hubble telescope was deployed by a NASA Space Shuttle in 1990. Subsequent Shuttle missions have repaired and added additional capabilities to HST. http://www.nasa.gov/mission_pages/hubble/main/index.html

  21. Galaxies on a Collision Course in the Hubble Ultra Deep Field Image

  22. Hubble

  23. Hubble Space Telescope • Hubble optics • Images…

  24. Chandra X-Ray Observatory • The Chandra X-ray Observatory, which was launched by Space Shuttle Columbia in 1999, can better define the hot, turbulent regions of space. This increased clarity can help scientists answer fundamental questions about the origin, evolution, and destiny of the universe From: http://www.nasa.gov/mission_pages/chandra/main/index.html

  25. Chandra X-Ray Observatory

  26. Chandra X-Ray Observatory • X-rays are produced in the cosmos when matter is heated to millions of degrees. Such temperatures occur where high magnetic fields, or extreme gravity, or explosive forces, occur. • Images • More….

  27. Summary • NASA's Great Observatories

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