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Studying space

Telescopes. Studying space. Telescope. An instrument that collects electromagnetic radiation from objects in space Concentrates the electromagnetic radiation for better observation. Optical Telescopes. Most common type of telescope

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Studying space

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  1. Telescopes Studying space

  2. Telescope • An instrument that collects electromagnetic radiation from objects in space • Concentrates the electromagnetic radiation for better observation

  3. Optical Telescopes • Most common type of telescope • Used to study visible light from objects in universe • Enables you to see millions of stars

  4. Refracting Telescopes • Use lenses to gather and focus light

  5. Two Disadvantages of Refracting Telescopes • Images cannot be perfectly focused • Size of objective lens limits the size of the telescope

  6. Reflecting Telescopes • Use a curved mirror & a flat mirror to gather & focus light

  7. Three Advantages of Reflecting Telescopes • Large mirrors can gather more light. • Flaws in the mirror’s glass do not affect the light. • Mirrors can focus all colors of light at the same time.

  8. Optical Telescopes & Atmosphere • Air above telescope makes starlight shimmer & blur. • Light pollution affects ability to see dim objects.

  9. Placement of Telescopes • Dry environments • Mountaintops • Less light pollution • Less air pollution • Air is thinner • Space

  10. Electromagnetic Spectrum

  11. Detecting Electromagnetic Radiation • EM spectrum = all of the wavelengths of electromagnetic radiation • Each color of light is a different wave- length. • Humans can see radiation from red light (long wave) to blue light (shorter wave).

  12. Nonoptical Telescopes • Used to study invisible radiation • Each type of EM radiation gives different clues about objects

  13. Detecting Electromagnetic Radiation • Visible light is small part of EM spectrum. • Most of EM spectrum is invisible • Radio waves (longest waves) • Microwaves • Infrared waves • Ultraviolet waves • X-rays • Gamma waves (shortest waves)

  14. Radio Telescopes • Detect radio waves • Can be linked with other radio telescopes • Surface does not have to be solid • Must be much larger than optical telescopes • Radio waves can be as large as a building

  15. Radio Telescope & VLA

  16. Nonoptical Telescopes in Space • Placed in space because most EM radiation is blocked by Earth’s atmosphere

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