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Chapter 21, section 1

Chapter 21, section 1. Tools of Modern Astronomy By Rusty Sturken. Electromagnetic Spectrum. Electromagnetic radiation is energy that can travel directly through space in the form of waves Electromagnetic spectrum is the range of wavelengths of electromagnetic waves

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Chapter 21, section 1

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  1. Chapter 21, section 1 Tools of Modern Astronomy By Rusty Sturken

  2. Electromagnetic Spectrum • Electromagnetic radiation is energy that can travel directly through space in the form of waves • Electromagnetic spectrum is the range of wavelengths of electromagnetic waves • Visible light is light that you can see with your eyes

  3. Electromagnetic Spectrum Visible Spectrum Image from http://www.lcse.umn.edu/specs/labs/images/spectrum.gif

  4. Telescopes • A telescope is a device built to study distant objects by making them appear closer • A refracting telescope uses convex lenses to gather a large amount of light onto a small area • A reflecting telescope uses mirrors to gather a large amount of light onto a small area

  5. Telescopes • A radio telescope uses curved, reflecting surfaces to concentrate faint radio waves from outer space onto small antennas

  6. Refracting telescope Image on left from http://www.dkimages.com/ discover/previews/941/25018530.JPG Image on right from http://www.adlerplanetarium.org/research/collections/ instruments/images/g33_72.jpg

  7. Reflecting Telescope Image on left from http://astro-canada.ca/_en/_illustrations/a4304_newton_en_p.jpg Image on right from http://www.stargazer.htmlplanet.com/telescope.jpg

  8. Radio Telescope Very Large Array Telescope Arecibo Radio Telescope Image on left from http://pro.corbis.com/images/RF4411534.jpg?size=572&uid=%7BD0356A80-EEEE-4A3C-ACBA-86BB2F75551D%7D Image on right from http://www.aoc.nrao.edu/~emomjian/ao002.jpg

  9. Hubble Space Telescope Image from http://www.sc.gov/NR/rdonlyres/93C9CEAE-361E-4F3B-B4C4-CEDD151A6321/2769/FloatingHubble.jpg

  10. Spectrographs • A spectrograph breaks light from an object into colors and photographs the resulting spectrum. It can tell: • Chemical composition of a star • Temperature of a star Image from http://www.astrosurf.com/aras/dearden/Telescope&Spectrograph2.jpg

  11. Spectrographs

  12. Spectrographs Image from http://www.scienceinschool.org/repository/images/issue4spectrometer11_large.jpg

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