1. ASTR-1010 Planetary Astronomy
Day - 19

2. Announcements Smartworks Chapters 4: Due Monday, March 1.
Smartworks Chapter 5 is also posted
Exam 2 will cover chapters 3, 4, & 5
-Target Wednesday, March 3
***Bring your Lecture-Tutorial books to the exam.
They will be collected and graded.
- Make SURE your name is in it!

3. Once a site with good “seeing” is found everyone wants to use it
Kitt Peak, AZ

4. Mauna Kea Hawaii

5. Today most observations are done with a CCD Camera

6. CCD’s are much more sensitive than photographic film

7. ClassAction Stuff
CCD Simulator
Splash page questions

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

9. Another common measuring device is the spectrograph

10. The best spectrographs use diffraction gratings

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

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

13. Multitasking Saves Time

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

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

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

17. Observations at other wavelengths are revealing previously invisible sightsUV
infrared
Map of Orion region
Ordinary visible

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

19. Observing In Radiowaves
Long Wavelength…poor resolution

20. Under the dish at Arecibo

21. The Very Large Array (VLA)

22. Saturn In Different Wavelengths
Near IR
Visible
Radio

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

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

25. Atmospheric Windows

26. Telescopes and Earth’s Atmosphere Lecture 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.

27. 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.

28. 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