CK12- Study of Space by the EM Spectrum Student Name: _______________________________________ Date: ___________ Period: _________________ Main Concepts Facts, descriptions, main points, definitions, picture, or explanations How do scientists learn about space? Electromagnetic Spectrum Speed of Light Light-years Looking back in Time Only write new information you learn for these sections Electromagnetic Waves Electromagnetic Spectrum Write a one sentence summary of the article that highlights the most important concepts. Review Questions: 1. Why do astronomers use light-years as a measure of distance? 2. How long would it take a beam of light to travel from New York to LA? 3. How long does it take light to reach Earth from the Sun? 4. How long is a light-year? 5. How long would it take for a beam of light to travel from one side of our galaxy to the other? 6. What is the closest star to earth & how far away is it? 7. In the electromagnetic spectrum, which wavelengths are shorter than visible light? Which are longer than visible light? Which are relatively cooler? Which are relatively hotter? 8. Why does light we see today tell us something about what happened earlier in the history of the Universe? CK12- Expansion of the Universe Student Name: _______________________________________ Date: ___________ Period: _________________ Main Concepts Facts, descriptions, main points, definitions, picture, or explanations What is Doppler Effect? Expansion of the Universe Red Shift The Expanding Universe Write a one sentence summary of the article that highlights the most important concepts. Review Questions 1. What cause the sound of a siren to higher pitch as it moves towards you and a lower pitch as it moves away from you? 2. What causes the dark bands on the spectrum when we view stars through a prism? 3. What can we learn about stars from these absorption lines? 4. Where was helium first discovered? 5. What is redshift? 6. What does it mean that stars & galaxies are red shifted? 7. What type of shift do the majority of objects in space have? 8. What is Hubble’s law? 9. What object does the article use as an analogy to demonstrate Hubble’s Law. 10. What was one flaw in the analogy?