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Our Galaxy

Our Galaxy. Write you address: 16825 Spring Cypress Road Cypress TX, 77429 United States of America Earth, Solar System 2/3 Orion-Cygnus Arm Milky Way, Local Group Virgo Super Cluster Universe. How old is the Milky Way?. Approximately 13.2 Billion years old

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Our Galaxy

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  1. Our Galaxy • Write you address: • 16825 Spring Cypress Road • Cypress TX, 77429 • United States of America • Earth, Solar System • 2/3 Orion-Cygnus Arm • Milky Way, Local Group • Virgo Super Cluster • Universe

  2. How old is the Milky Way? • Approximately 13.2 Billion years old • Easily seen in Rural areas when the Moon is below the horizon.

  3. Where are you from? Theories: Origin of the Universe

  4. Religion teaches men how to go to heaven, not how the heavens go. ~Galileo Galilee 1630

  5. Steady State Theory

  6. Steady State Theory • Universe appears the same throughout all of time. • No end or beginning. • New matter is created to fill in the voids created by expansion.

  7. Pulsating Theory

  8. Pulsating Theory • Universe oscillates between expanding and contracting. • Big bangs and big crunches occur repeatedly with this model.

  9. Big Bang Theory

  10. Big Bang Theory • Georges Lemaitre (1894-1966) • Catholic priest in Vatican Observatory • Independently derived Friedman’s equation (that describes the universe) and used Einstein's work to show the universe expanded from a single point with primeval atoms in 1927.

  11. Evidence: Olber’s Paradox

  12. Evidence: Olber’s Paradox • Heinrich E. M. Olbers 1758-1840 • 1826: States that the darkness of the night sky conflicts with the supposition of an infinite and eternal static universe.

  13. Evidence: Hubble’s Law • In 1929, Edwin Hubble described how galaxies are receding in every direction at velocities proportional to their distance from Earth and each other. • In other words: The universe is expanding

  14. Hubble’s law: Doppler effect

  15. Evidence: Hubble’s law

  16. Evidence: Hubble’s law

  17. Evidence: Hubble’s Law • Using distance and velocity measurements, we can cacluate how old the universe is. • T= d/v 4.4x1017 seconds Calculate how old the universe is!

  18. Evidence: Hubble’s Law 4.14x1017 seconds = approximately 14.6 Billion years

  19. Evidence: Nucleosynthesis • Creation of new atomic nuclei from pre existing protons and neutrons

  20. Evidence: CMBR • Cosmic Microwave Background Radiation • Thermal radiation filling the observable universe almost uniformly. • Detected with sensitive radio telescopes. • Discovered in 1964 by American radio astronomers Arno Penzias and Robert Wilson.

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