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SATELLITES : is any natural or artificial object that revolves around an object in space

Standard 8-4.10 Compare the purposes of the tools and the technology that scientists use to study space (including various types of telescopes, satellites, space probes, and spectroscopes) Video – Space Files - telescopes.

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SATELLITES : is any natural or artificial object that revolves around an object in space

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  1. Standard 8-4.10Compare the purposes of the tools and the technology that scientists use to study space (including various types of telescopes, satellites, space probes, and spectroscopes)Video – Space Files - telescopes http://player.discoveryeducation.com/index.cfm?guidAssetId=10EB83A2-3DC1-40DC-BBFA-9C399063F42E&blnFromSearch=1&productcode=DSC

  2. SATELLITES: is any natural or artificial object that revolves around an object in space • Used for communications, navigation, collecting weather data, research and military purposes. • Are placed in orbit around Earth with instruments and telescopes that collect info from space and are not hampered by Earth’s atmosphere. • Give off signals that can be picked up by small receivers on Earth. • Soviet Union (Russia) launched the first satellite into orbit in 1957. Geosynchronous orbit – Satellites that revolves around the Earth at the same rate that Earth rotates Used to relay television signals and map weather patterns. A north to south satellite represents a spy satellite!

  3. Sputnik 1 pioneered SovietSputnik program and ignited the so-called Space Race within the Cold War.

  4. SPACE PROBES: are rockets that contain instruments to collect data in space and explore places that would be too dangerous for astronomers. • Instruments in the probe varies, depending upon the space mission. • Unmanned spacecraft Voyager Go to video on Phoenix

  5. TELESCOPES: is an instrument used to enlarge the image of a distant object. 2 TYPES OF TELECOPES ARE REFRACTING AND REFLECTING - Both are Optical telescopes: collect visible light, they use convex lens ormirrors to focus the light producing larger, brighter images of distant objects in space. - Refracting Telescope: is usually made with two tubes that fit together snugly. It uses lenses – concave and convex.

  6. Advantages to Refracting Telescopes • Refractor telescopes are rugged (do not need to be realigned often). • The glass surface inside the tube is sealed from the atmosphere so it rarely needs cleaning. • Since the tube is closed off from the outside, air currents and effects due to changing temperatures are eliminated. • This means that the images are steadier and sharper than those from a reflector telescope of the same size.

  7. Drawbacks to Refracting Telescopes • The lens is supported only around the edges. • Light of different wavelengths comes to a focus in different places. • It is difficult to make a glass lens with no imperfections inside the lens.

  8. - Reflecting Telescope: has two mirrors. The primary mirror is a large concave mirror that receives the image and reflects it to a secondary mirror. The Hubble Space Telescope is a powerful orbiting telescope that provides sharper images of heavenly bodies than other telescopes do. It is a reflecting telescope with a light-gathering mirror 94 inches http://hubblesite.org/hubble_discoveries/hubble_deep_field/

  9. Reflecting Optical Telescope Advantages The mirror in a reflector can be supported not only around the edges, but also all over the back surface. That means that very large mirrors can be placed into telescopes. Reflector telescopes are cheaper to make than refractors of the same size

  10. Reflecting Optical Telescope Disadvantages • It is easy to get the optics out of alignment. • A reflector telescope's tube is open to the outside and the optics need frequent cleaning.

  11. ANOTHER TYPE OF TELECOPE IS THE RADIO TELESCOPE • Receive radio waves emitted from objects in space, including from very distant stars and galaxies • It can receive information in any weather and during day or night. • Used in tracking and collecting data from satellites and space probes

  12. OTHER TYPE OF TELESCOPES READ INFRARED OR X-RAY SIGNALS. - They have to be placed where Earth’s atmosphere does not block or absorb the signals.

  13. http://amazing-space.stsci.edu/resources/explorations/light/CatchWaves_frames.htmlhttp://amazing-space.stsci.edu/resources/explorations/light/CatchWaves_frames.html Right Click on each picture to open up the link for detailed information.

  14. SPECTROSCOPES: Collect the light from distant stars and separate that light into bands of different colors; by studying these bands, astronomers identify the elements in a star.

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