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With a partner on page 55 create a definition for what is a: Theory Write 2 examples

With a partner on page 55 create a definition for what is a: Theory Write 2 examples Click here for video flow chart. Scientific Theory.

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With a partner on page 55 create a definition for what is a: Theory Write 2 examples

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  1. With a partner on page 55 create a definition for what is a: Theory Write 2 examples Click here for video flow chart

  2. Scientific Theory • A scientific theory is an explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. Such fact-supported theories are not "guesses" but reliable descriptions of the real world.

  3. Formation of the Universe • The Big Bang Theory • (BBT)

  4. Red Shift • Shift of wavelengths of light towards the red end of the spectrum; happens as a light source moves away from us (Earth). • Red shift is related to the Doppler Effect: • Change in frequency of a wave for an observer moving relative to its sourceclick for video

  5. Red Shift Visual

  6. Hubble’s Law • The farther away a galaxy is, the faster it is moving away from us. • Used Red Shift data to come to this conclusion.

  7. Expanding Universe • What’s the Big Deal!? • - If we study this expansion we can determine: • ~How the universe formed • ~Age of universe • ~Could support idea of galaxy formation; material stayed in clumps then pulled together over time

  8. Expanding Universe Visual

  9. Extra Help • https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/red-shift

  10. Doppler Effect • See how the wavelength is compressed due to movement of the car. • This works similarly with light as it moves away from Earth.

  11. Background Radiation • Background Radiation • Called Cosmic Microwave Background Radiation (CMB) • ‘Left over’ thermal radiation from Big Bang • This has been observed and is nearly uniform throughout the entire universe

  12. CMB Visual

  13. CMB Radiation • CMB so uniform it is nearly impossible to explain where else it could have come from • By studying CMB we have identified the Universe to be about 13.7 billion years old

  14. Evidence for BBT • Red Shift • Expansion of the Universe • CMB • Uniform radiation throughout the Universe

  15. Review-- Write In Notebook 1. How did Hubble determine that the universe is expanding? 2. How do astronomers determine the composition of distant stars? 3. What is the significance of the idea that the universe is expanding?

  16. Big Bang Balloon Activity • Title : Big Bang Balloon Activity • Purpose: To model the expansion of the universe over time • Procedure:See Handout

  17. Big Bang Balloon Activity • Data Table:

  18. Big Bang Balloon Activity • Conclusion: answer the following questions in your notebook, under the heading “Conclusion.” • Be sure to use complete sentences. • 1. How did the distance from the home dot to each of the other galaxies change each time you inflated the balloon? • 2. Did the galaxies near home or those farther away appear to move the greatest distance?

  19. Big Bang Balloon Activity • Conclusion: answer the following questions in your notebook, under the heading “Conclusion.” • Be sure to use complete sentences. • 3. How does this activity help to explain how the big bang could have happened? • 4. How could you use this model to simulate the “Big Crunch” a time when all the galaxies might collapse in on themselves? What would you do to your balloon?

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