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Physics of the Cosmos

Physics of the Cosmos. Secs 37.1-37.3. Reminders. Lab B2 - WNL Wave Natur e of Light due Friday @ 4 In-class Quiz # 6 Tuesday , April 22 Quiz #6 will address chapters 29 and 37 Car Crash Reconstruction extra credit due Thursday , May 1, in class, hard copy.

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Physics of the Cosmos

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  1. Physics of the Cosmos Secs 37.1-37.3

  2. Reminders • Lab B2-WNLWave Nature of Light due Friday @ 4 • In-class Quiz #6 Tuesday, April 22 • Quiz #6 will address chapters 29 and 37 • Car Crash Reconstruction extra credit due Thursday, May 1, in class, hard copy. • Reading quiz due prior to class on Thursday • Final exam, Monday, May 5, 7:50-9:50 a.m. (morning – in this room)

  3. But first… the Cosmos • The Night Sky • The Milky Way • Stars (individual, binary, variable) • Clusters (globular and open) • Nebulae (reflection, emission, dark, planetary) • SNRs, Neutron Stars, & Black Holes • Galaxies • The Universe

  4. The Night Sky

  5. The Milky Way

  6. Galactic Structure

  7. Individual Stars

  8. Binary Stars

  9. Variable Stars

  10. Clusters Open Globular

  11. Nebulae I Emission Dark

  12. Nebulae II Reflection Planetary

  13. SNRs, Neutron Stars & Black Holes SNR with Neutron Star Black Hole Model

  14. Galaxies I Spiral Barred Spiral

  15. Galaxies II Elliptical Irregular

  16. The Universe

  17. Matter & Radiation Dominance • The Big Bang started off immensely hot! • The time since the beginning of the universe is 1/H years or about 13.8 billion years. • Radiation dominated the early universe. • Matter dominance occurs after radiation “cools” enough for matter to condense per the relationship E=mc2.

  18. Matter Dominance (today) • The universe is composed mostly of matter. • Most of the past 13.8 billion years has been dominated by matter. • Our “horizon” is 13.8 billion light years away. • During this period, the rate of expansion has been slowing (but for some recent findings!) • In the past, H was much higher.

  19. Radiation Dominance (early) • Radiation dominated the early universe. • The nature of the radiation was that of a black body radiator at an extremely high temp. • Remnants of the early universe are BB-like, but strongly red-shifted.

  20. Wien’s Law

  21. Stefan-Boltzmann Law

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