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Astronomy Unit

Discover the wonders of space through the electromagnetic spectrum, the use of telescopes, and the history of space exploration. Learn about different types of telescopes, the impact of light pollution, and significant milestones in American and non-manned space exploration. Don't miss the groundbreaking discoveries made by the Hubble Space Telescope!

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Astronomy Unit

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  1. Astronomy Unit

  2. Exploring Space • Use of electromagnetic spectrum • Starlight carries information • use spectroscope • Travels at speed of light (300,000 k.p.s.) • Starlight is old

  3. Electromagnetic Spectrum • From longest to shortest wavelength • radio waves • microwaves • infrared radiation • visible light • ultraviolet radiation • X-rays • gamma rays

  4. Electromagnetic Radiation Red, Orange, Yellow, Green, Blue, Indigo, Violet Xray Infrared Gamma Radio Microwave UV

  5. Telescopes • Bring distant objects closer or collects faint light so that it may be seen • Stars appear as dots • Two types of optical: reflecting and refracting • Radio telescopes search for radio waves

  6. Refracting Telescope • Uses glass lenses to collect light • Convex lenses • Objective lens collects light • Eyepiece focus light in eye • Image is virtual • Limited in size

  7. Reflecting Telescopes • Uses concave mirrors to collect light • Mirror or prism redirects light • Uses lens in eyepiece to focus light in eye • Can be made up to 200 inches in diameter

  8. Radio Telescopes • Large antenna • Wider range of energy • Can be used day and night • Used in arrays to enhance abilities • Used to search the furthest distances

  9. Optical Telescopes Refracting Reflecting

  10. Light Pollution • Optical telescopes affected by sodium vapor, mercury vapor light • Obscures the starlight • Observatories located on mountains, in rural areas

  11. American Manned Space Exploration • Project Mercury • Russian first in space (Yuri Gaggarin) • One person craft • First American in space: Alan B. Sheppard • First orbital: John Glenn

  12. Project Gemini • Two person crew • Prepared to go to the moon • Practiced docking

  13. Project Apollo • Project to land a man on the moon and return them safely before the end of the decade • Crew of three • Apollo 11 first to land on moon • Neil Armstrong/Buzz Aldrin

  14. Non-Manned Exploration • Sputnik - S - first to go to space • Ranger - mapped moon • Voyager - explored planets • Mariner - landed on Mars • Galileo - studied Jupiter

  15. Shuttle Fuel Tank SRB • First designed reuseable space craft • Orbiter, external fuel tank, solid rocket boosters • Lost Challenger in tragic accident • Used like truck • Building ISS Orbiter

  16. International Space Station

  17. Non-Manned Exploration • Hubble Space Telescope • used to see to the greatest distances in space • Discovered other planets

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