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Transcript
Tools of Modern Astronomy: Read pages 784-790 in the textbook to find the answers to the question below. Use the back of this page or a sheet of binder paper if you need more room for the answers. 1. What did enslaved African Americans follow as they moved north to the Free States? What are constellations? 2. What are stars? What kind of light do your eyes see? What is light? How does electromagnetic radiation travel through space? What kind of radiation does a electric heater give off? Can you see radio waves? 3. What is wavelength? How big is the wavelength of visible light? What is a spectrum? What does the electromagnetic spectrum include? Where is visible light located on the electromagnetic spectrum? What color has the longest wavelength? What color has the shortest wavelength? 4. Objects in space give off what type of electromagnetic radiation? What type of telescope did Galileo use? How does a refracting telescope work? What is a convex lens? What is focal length? What is a reflecting telescope? Who first used a reflecting telescope? What are most visible light telescopes today? 5. What are radio telescopes? How big can they be in diameter? Are they like refracting or reflecting telescopes? Are radio waves coming from space strong or weak? Where is the reflected radio waves collected? What kinds of electromagnetic radiation do other telescopes collect? What is an observatory? Why have astronomers built light telescopes on top of mountains? Where is the best observatory on Earth? When do astronomers who look through light telescopes work? When can radio astronomers work? 6. What type of telescopes are placed on satellites? Why? Where is the Hubble Space Telescope? How big is its mirror? How many more times can the Hubble see detail than the best visible light telescopes on Earth? What are types of radiation can the Hubble see? 7. What does a spectrograph do? What two types of data can astronomers get from spectrographs? What do chemical elements in the atmosphere of a star do to radiation streaming from star? How do astromomers identify different elements on a spectrum of starlight? 8. What is the chemical composition of most stars (including the Sun)? What effects the amount of energy each element absorbs? How do astronomers determine the temperatures of stars? At what temperature does hydrogen produce strong spectral lines?