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Telescopes

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Telescopes

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Presentation Transcript

  1. Telescopes

  2. Forms of Radiation • Electromagnetic radiation - energy that travels across distances as certain types of waves (ex: visible light) • Electromagnetic radiation travels in all directions throughout space

  3. Forms of Radiation • Astronomers can often learn about the size, distance, and movement of an object by studying its radiation • Radiation can also reveal what an object is made of and how it has changed

  4. Forms of Radiation • Spectrum– a beam of white light separated into a range of colors (red, orange, yellow, green, blue, indigo, and violet) • In a spectrum, the colors of visible light appear in the order of their wavelengths

  5. Forms of Radiation • Wavelength– the distance between one wave peak and the next wave peak

  6. Telescopes • Telescope – a device that gathers electromagnetic radiation • 2 types of Visible Light Telescopes • Reflecting Telescope - has a curved mirror that gathers light • Refracting Telescope - has an objective lens, or curved piece of glass at one end of a long tube, which gathers light

  7. Telescopes

  8. Telescopes • Most powerful visible-light telescopes are built on mountaintops in rural areas because these locations allow a better view of the night sky • The Earth’s atmosphere (movement of air) is what makes the stars appear to twinkle

  9. Telescopes • Radio Telescope - shows where radio waves are being emitted by objects in space • Telescopes in space obtain clearer images than ground-based telescopes because there is no interference with the atmosphere • The telescopes in space send images and measurements back to Earth electronically