Week 3
2.
What is a wave? Use the terms wavelength and frequency in your definition.
5.
Explain how emission lines and absorption lines are formed. In what sorts of cosmic objects would you expect to see each?
9.
Explain why light is referred to as electromagnetic radiation.
18.
Explain how we can deduce the temperature of a star by determining its color.
22.
Explain how we use spectral absorption and emission lines to determine the composition of a gas.
https://openstax.org/books/astronomy/pages/5-thinking-ahead
Week 4
1.
What are the three basic components of a modern astronomical instrument? Describe each in one to two sentences.
2.
Name the two spectral windows through which electromagnetic radiation easily reaches the surface of Earth and describe the largest-aperture telescope currently in use for each window.
9.
What is a charge-coupled device (CCD), and how is it used in astronomy?
13.
Why do astronomers place telescopes in Earth’s orbit? What are the advantages for the different regions of the spectrum?
16.
What kind of visible-light and infrared telescopes on the ground are astronomers planning for the future? Why are they building them on the ground and not in space?
https://openstax.org/books/astronomy/pages/6-thinking-ahead
Last Completed Projects
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