Lecture 25 - The Genesis and the Fate of the Universe

Lecture 25 - The Genesis and the Fate of the Universe - The...

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The Genesis and the Fate of the Universe ASTRONOMY 3 Lesson 25 1 The cosmic microwave background as observed by WMAP (Wilkinson Microwave Anisotropy Probe). The spherical depiction on the right shows the area explored by the SDSS redshift survey in white.
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NATURE of the Universe Review of Lesson 24 • Dark matter is the dominant form of matter in the Universe. • Using telescopes, we can study galaxies at times when the Universe was less than 1 billion years old. Larger galaxies have evolved out of mergers of smaller proto-galaxies • The distribution of galaxies in the Universe is patchy. Galaxies line up in large filaments, separated by large voids. • The Universe does not have any preferred place or direction. Summary of Lesson 24: 2
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NATURE of the Universe Questions from Lesson 24 Astronomy - Genesis & Fate of the Universe Think about (questions from Lesson 24): • How do we know about the age of the Universe? • How do we know about the Big Bang? 3
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• The Hubble constant and the Age of the Universe (Ch. 17.2) • The Big Bang and the Formation of Structure (Ch. 17.5, 17.6, 17.8) • The Fate of the Universe (Ch 17.4) • Summary • Evaluation of Instructions NATURE of the Universe Today’s Topics Astronomy - Genesis & Fate of the Universe see also Lab 9 on “Expansion of the Universe” 4
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NATURE of the Universe Age of the Universe Astronomy - Genesis & Fate of the Universe In 1917, Einstein published his “Cosmological Considerations of the Theory of General Relativity”. C.W. Wirtz in 1924, and E.P. Hubble in 1929 found that distant galaxies are moving away from us, i.e. that the Universe is expanding . For the Universe to remain static (i.e. non-expanding), Einstein had to add a term called the Cosmological Constant to his equations. 5
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NATURE of the Universe Age of the Universe Astronomy - Genesis & Fate of the Universe When did the expansion of the Universe start? How old is the Universe? (see Lab 9 ) distance = velocity * time = 70 miles/hr * 2 hr = 140 miles time = 1 / H 0 (Hubble constant: H 0 = 70 km/s / Megaparsec) Hubble’s law for galaxies: distance (Mpc) = velocity (km/s) / H 0 If you drive on the freeway at 70 mph, how how far do you get in 2 hr? 1/H
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Lecture 25 - The Genesis and the Fate of the Universe - The...

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