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Section 5: The Expanding Universe page 622

Section 5: The Expanding Universe page 622. The Big Bang Theory. According to the Big Bang theory, the universe was formed in an instant, billions of years ago, in an enormous explosion. Monsignor Georges Henri Joseph Edouard Lemaitre. Evidence of the Big Bang Theory 1: Retreating Galaxies.

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Section 5: The Expanding Universe page 622

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  1. Section 5:The Expanding Universepage 622

  2. The Big Bang Theory According to the Big Bang theory, the universe was formed in an instant, billions of years ago, in an enormous explosion. Monsignor Georges Henri Joseph Edouard Lemaitre

  3. Evidence of the Big Bang Theory 1: Retreating Galaxies All of the distant galaxies astronomers have observed are moving rapidly away from our galaxy and from each other. Edwin Hubble

  4. Speeding Galaxies • Use the graph to answer the questions about moving clusters of galaxies.

  5. About 2.5 billion light-years; about 39,000 km/sec Reading Graphs: How far away is the Bootes cluster? How fast is it moving? Speeding Galaxies

  6. Hydra; Virgo Reading Graphs: Which galaxy is moving away the fastest? Which galaxy is closest to Earth? Speeding Galaxies

  7. The greater the distance from Earth, the greater the speed of the galaxy. Drawing Conclusions: How are the distance and speed of a galaxy related? Speeding Galaxies

  8. Its speed would be about 80,000 km/s. Predicting: Predict the speed of a galaxy that is 5 billion light-years from Earth. Speeding Galaxies

  9. Moving Galaxies • The galaxies in the universe are like the raisins in rising bread dough, moving away from the center; the ones farthest away are moving the fastest.

  10. Evidence for the Big Bang Theory 2: Cosmic Background Radiation The cosmic background radiation is the leftover thermal energy from the big bang. Arno Penzias Robert Wilson

  11. Age of the Universe • Present theory places the age of our universe at 13.7 billion years old.

  12. Formation of the Solar System About 5 billion years ago, the solar system formed from a collapsing cloud of gas and dust.

  13. The Future of the Universe New observations lead many scientists to believe that the universe will expand forever.

  14. Dark Mysteries Dark Matter --- Matter that does not give off electromagnetic radiation. Dark Energy --- A mysterious new force that is causing the universe to expand more rapidly.

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