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Understanding the Electromagnetic Spectrum: Astronomers' Key to Exploring the Universe

Astronomers utilize the electromagnetic spectrum, comprising various waves, to unravel the mysteries of the universe. Each type of electromagnetic radiation, from radio waves to gamma rays, provides unique insights into celestial phenomena. Radio waves reveal stellar composition, while infrared wavelengths help map interstellar dust. Visible light informs us about star temperatures and the shifts that indicate movement. Higher energies like ultraviolet rays and X-rays are essential for studying galaxy structures and detecting black holes. Gamma rays offer insights into cosmic events such as supernovae and black hole formations.

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Understanding the Electromagnetic Spectrum: Astronomers' Key to Exploring the Universe

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  1. Topic: Electromagnetic Spectrum Essential Question: How do astronomers use the electromagnetic spectrum to study the universe?

  2. Topic: Electromagnetic SpectrumEssential Question: How do astronomers use the electromagnetic spectrum to study the universe? Electromagnetic Spectrum The range of radiant (light) energy arranged in order of wavelength and frequency

  3. Topic: Electromagnetic SpectrumEssential Question: How do astronomers use the electromagnetic spectrum to study the universe? Wavelength • The distance between two crests of a wave Frequency • A count of the number of crests that pass a point in a given amount of time • High frequency = high energy

  4. Topic: Electromagnetic SpectrumEssential Question: How do astronomers use the electromagnetic spectrum to study the universe? Radio Waves • Astronomers use them to study what stars are made of, their structure and movement Microwaves • Used to cook your food • Used to learn about galaxies • Used to learn about stars that are behind clouds of dust

  5. Radio Waves used to look at the Sun

  6. Topic: Electromagnetic SpectrumEssential Question: How do astronomers use the electromagnetic spectrum to study the universe? Infrared Waves • Used by astronomers to map dust between stars Visible Light • Rainbows show the different wavelengths of light • We are able to see colors of stars which gives us a clue about their temperature • Helps us understand the Red Shift and Blue Shift

  7. Visible Light Infrared

  8. Topic: Electromagnetic SpectrumEssential Question: How do astronomers use the electromagnetic spectrum to study the universe? Ultraviolet Rays • Used to learn about the structure and how galaxies change X-Ray Wave • Used to detect black holes because black holes give off X-Ray waves

  9. Topic: Electromagnetic SpectrumEssential Question: How do astronomers use the electromagnetic spectrum to study the universe? Gamma Rays • Given off from any explosion like a supernova or a black hole • Astronomers use them to gain knowledge of how our universe began and how fast it is expanding

  10. Now take some time… • Take 2 minutes to go over your notes and highlight or underline the main ideas that answer the essential question, you should not highlight everything: • Essential Question: How do astronomers use the electromagnetic spectrum to study the universe?

  11. Time to use the left hand column • You will now write your own questions using the verbs provided.

  12. Topic: Electromagnetic SpectrumEssential Question: How do astronomers use the electromagnetic spectrum to study the universe? Choose one verb to write your question: Define Describe Explain Electromagnetic Spectrum The range of radiant (light) energy arranged in order of wavelength and frequency

  13. Topic: Electromagnetic SpectrumEssential Question: How do astronomers use the electromagnetic spectrum to study the universe? Choose one verb to write your question: Define Describe Explain Wavelength • The distance between two crests of a wave Frequency • A count of the number of crests that pass a point in a given amount of time • High frequency = high energy

  14. Topic: Electromagnetic SpectrumEssential Question: How do astronomers use the electromagnetic spectrum to study the universe? Choose one verb to write your question: Define Describe Explain Radio Waves • Astronomers use them to study what stars are made of, their structure and movement Microwaves • Used to cook your food • Used to learn about galaxies • Used to learn about stars that are behind clouds of dust

  15. Topic: Electromagnetic SpectrumEssential Question: How do astronomers use the electromagnetic spectrum to study the universe? Choose one verb to write your question: Define Describe Explain Infrared Waves • Used by astronomers to map dust between stars Visible Light • Rainbows show the different wavelengths of light • We are able to see colors of stars which gives us a clue about their temperature • Helps us understand the Red Shift and Blue Shift

  16. Topic: Electromagnetic SpectrumEssential Question: How do astronomers use the electromagnetic spectrum to study the universe? Choose one verb to write your question: Define Describe Explain Ultraviolet Rays • Used to learn about the structure and how galaxies change X-Ray Wave • Used to detect black holes because black holes give off X-Ray waves

  17. Topic: Electromagnetic SpectrumEssential Question: How do astronomers use the electromagnetic spectrum to study the universe? Choose one verb to write your question: Define Describe Explain Gamma Rays • Given off from any explosion like a supernova or a black hole • Astronomers use them to gain knowledge of how our universe began and how fast it is expanding

  18. Now let’s write a summary Look at each question you wrote on your own, and answer each question in a complete sentence.

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