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ASTR-1010 Planetary Astronomy

ASTR-1010 Planetary Astronomy. Day 13. Announcements. Read Chapter 5 Homework Chapter 5 --- due Thursday Oct. 14 1 st Quarter observing sessions: Wed. Oct. 13 @ 7:00 pm Thur. Oct. 14 @ 7:00 pm Exam-2 – Thurs. Oct. 14 Mon. Nov. 8 – last day to drop with a “W” “F” or “FA”.

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ASTR-1010 Planetary Astronomy

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  1. ASTR-1010Planetary Astronomy Day 13

  2. Announcements Read Chapter 5 Homework Chapter 5 --- due Thursday Oct. 14 1st Quarter observing sessions: Wed. Oct. 13 @ 7:00 pm Thur. Oct. 14 @ 7:00 pm Exam-2 – Thurs. Oct. 14 Mon. Nov. 8 – last day to drop with a “W” “F” or “FA”

  3. If you pass white light through a prism, it separates into its component colors. long wavelengths ROY G B I V short wavelengths spectrum

  4. Another common measuring device is the spectrograph

  5. The best spectrographs use diffraction gratings

  6. The spectrograph/CCD produces a black & white spectrum

  7. Spectra can be displayed as a graph or rainbow of color

  8. Multitasking Saves Time

  9. But visible light is only one type of electromagnetic radiation (light) emitted by stars Astronomers are truly interested in the entire spectrum of Light!

  10. Consider This Class as Seen in Different Wavelengths of Light!

  11. Consider Orion as Seen in Different Wavelengths of Light!

  12. Observations at other wavelengths are revealing previously invisible sights UV infrared Map of Orion region Ordinary visible

  13. Radio wavelength observations are possible from Earth’s surface

  14. Observing In Radiowaves Long Wavelength…poor resolution

  15. Under the dish at Arecibo

  16. The Very Large Array (VLA)

  17. Saturn In Different Wavelengths Near IR Visible Radio

  18. Astronomers use different instruments to look at light of different wavelengths - sometimes, we even have to go above Earth’s atmosphere.

  19. Not all EM radiation can penetrate Earth’s atmosphere.

  20. Atmospheric Windows

  21. Telescopes and Earth’s AtmosphereLecture Tutorial pg. 49 • Work with a partner! • Read the instructions and questions carefully. • Discuss the concepts and your answers with one another. Take time to understand it now!!!! • Come to a consensus answer you both agree on and write complete thoughts into your LT. • If you get stuck or are not sure of your answer, ask another group.

  22. Which is the correct reasoning for why a gamma ray telescope located in Antarctica that is to be used to look for evidence of black holes in the centers of galaxies would not get funded? • There is no way to detect the presence of a black hole. • Gamma rays are too energetic to detect with a telescope. • You can’t build a functioning telescope in Antarctica. • Gamma rays don’t penetrate Earth’s atmosphere.

  23. Imagine you’re the head of a funding agency that can afford to build only one telescope. Which of the four proposed telescopes below would be best to support? • A gamma ray telescope in Antarctica • A radio telescope in orbit above the Earth • A visible telescope located high on a mountain in Peru • An ultraviolet telescope located in the Mojave desert

  24. Exam 2

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